✅ Option D is correct because "him" and "her" are correctly used in the objective case as objects of the preposition "including."
Additionally, while "everyone" is grammatically singular, the use of "their" as a possessive adjective referring to "everyone" is widely accepted in modern English to avoid gender bias or awkward constructions like "his or her," especially when the gender of the individuals is mixed or unknown.
❌ Option A is incorrect because "she" and "I" are in the nominative case; after the preposition "to," the objective case pronouns "her" and "me" should be used (i.e., "to her and me").
❌ Option B is incorrect because "myself" is a reflexive or intensive pronoun and cannot serve as the subject of a sentence; it should be "My colleague and I" or "I and my colleague."
❌ Option C is incorrect because "we" is in the nominative case; after the preposition "to," the objective case pronoun "us" should be used (i.e., "to us, the most experienced members").
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