✅ Option D is correct because "Several" is an indefinite pronoun that is always plural, and it correctly takes the plural verb "were" to agree with its plural subject context ("Several of the ancient artifacts").

❌ Option A is incorrect. "Neither" is an indefinite pronoun that is always singular, so it should take a singular verb ("is viable") instead of the plural "are viable."

❌ Option B is incorrect. "Most" can be singular or plural depending on the noun it refers to. Here, it refers to "equipment," which is a mass noun (uncountable) and is generally treated as singular in English; thus, it should take a singular verb ("was still") instead of the plural "were still."

❌ Option C is incorrect. "Everyone" is an indefinite pronoun that is always singular, and therefore requires a singular verb ("agrees") instead of the plural "agree."

✅ "None" is the correct indefinite pronoun because it refers to "not one" or "no part" of the specified group (the historical documents), fitting the context of a quantity from a reviewed set.

❌ "No one" is incorrect as it refers exclusively to people, and the subject here is historical documents.

❌ "Nothing" refers to zero things in general, but "none" is more appropriate when referring to a specific quantity from a defined group, implying "not a single one of them."

❌ "Any" is typically used in questions or negative statements, often requiring a helping verb or an explicit negation elsewhere in the clause (e.g., "Didn't any offer...?" or "They didn't find any that offered..."), which is not the grammatical structure here.

✅ **Option A is correct.** The indefinite pronoun "Anybody" is always singular. Consequently, it requires a singular verb, "needs," which is correctly used here. The phrase "who attempts" also uses a singular verb, correctly agreeing with "Anybody."

❌ **Option B is incorrect.** "Each" is an indefinite pronoun that is always singular. Therefore, it requires a singular verb ("has been given"), not the plural "have been given."

❌ **Option C is incorrect.** "Some" is an indefinite pronoun whose number depends on the noun it refers to. In this sentence, "Some" refers to "texts," which is a plural countable noun; thus, it should take a plural verb ("were"), not the singular "was."

❌ **Option D is incorrect.** "Neither" is an indefinite pronoun that is always singular, meaning "not one and not the other." It correctly requires a singular verb ("was able"), not the plural "were able."

✅ The word "everything" is a compound indefinite pronoun that refers to all things or the entire amount, making it the most appropriate choice to represent the collective sum of "digital data" as the object of "safeguarding."

❌ While "all" can function as an indefinite pronoun, "everything" more explicitly and idiomatically refers to the complete set of *things* (in this case, data), providing a clearer and more precise fit for the context of protecting an entire domain of information.

❌ "Every" is a determiner (also known as a distributive adjective) and must always be followed by a noun (e.g., "every piece of data"). It cannot stand alone as a pronoun.

❌ "Each" can be an indefinite pronoun, but it typically refers to individual items within a group, emphasizing their distinctness. The sentence implies safeguarding the collective totality of digital data, for which "everything" is a better fit than focusing on individual units.

✅ Sentence D is correct because "Everything" is an indefinite pronoun that is always singular . It correctly takes the singular verb "was meticulously packed."

❌ Option A is incorrect because "Everyone" is a singular indefinite pronoun , but the verb "have arrived" is plural. It should be "has arrived."

❌ Option B is incorrect because "Neither" is a singular indefinite pronoun , but the verb "were able" is plural. It should be "was able."

❌ Option C is incorrect because "Many" is a plural indefinite pronoun , but the verb "believes" is singular. It should be "believe."