C) declaration, independence
Nouns can be common, or they can be proper. The rule with capitalization (for words not in the title of an article or book, that is) is that the first word of a sentence and proper nouns should be capitalized. Common nouns are nouns that are general words for people, places, or things. A proper noun is the name of a specific person, place, or thing. That said, looking back at the sentence, the only proper nouns not already capitalized are “declaration” and “independence” as the Declaration of Independence is the name of the specific document within which the United States declared its independence from England.