✅ Option D is correctly capitalized. "President of the United States" is a formal title referring to a specific individual and office, so it is capitalized. "State of the Union Address" is the official and specific title of a formal speech, functioning as a proper noun and therefore capitalized.

❌ In option A, "Chocolates" should not be capitalized as it is a common noun. Additionally, "you" should not be capitalized as it continues the same sentence within the quote, rather than starting a new one.

❌ In option B, "East" should not be capitalized because it refers to a direction, not a specific region. "Grandparents" should also not be capitalized as it is a common noun, not a proper name or title used directly with a name.

❌ In option C, "Article" should not be capitalized as it is a common noun. Moreover, in the article title "The impact of social media on modern society," major words should be capitalized according to title capitalization rules, making it "The Impact of Social Media on Modern Society."

✅ Option B is correct because "Professor" is capitalized as a title used directly before a proper noun ("Davis"), and "English" is capitalized as it is the name of a language, which is a proper noun. "University" is a common noun and should not be capitalized.

❌ Option A is incorrect. "Tuesday" (day of the week), "Lincoln Memorial" (specific landmark), and "Washington, D.C." (specific city and abbreviation) are all proper nouns and require capitalization.

❌ Option C is incorrect. "Monday" is a day of the week, which is a proper noun, and therefore must be capitalized.

❌ Option D is incorrect. "Sahara Desert" (specific geographic feature) and "North Africa" (specific geographic region) are proper nouns and must be capitalized.

✅ Option D is correct because "English" (a language) and "University of Cambridge" (a specific institution) are proper nouns requiring capitalization, while "institution" is a common noun and correctly lowercase.

❌ In option A, "Uncle" should be lowercase because it is not used as part of a proper name or in direct address (e.g., "Uncle Bob"). "Veteran" is also a common noun and should be lowercase unless part of a specific title.

❌ In option B, "Professor" should be lowercase because it is a common noun not directly preceding a name or used as part of a formal title. "Tuesday" is a day of the week and must always be capitalized.

❌ In option C, "Summer" should be lowercase because seasons are generally not capitalized unless they are part of a proper noun (e.g., "Summer Olympics").