Answer:
A. nouns
Step-by-step explanation:
There's a special rule when it comes to capitalizing words for a song, articles, or titles of books that is different from the general rule for capitalizing words. When the situation is the one just mentioned, most of the guides will tell you to capitalize verbs, adjectives, adverbs, and, importantly, nouns. Articles, conjunctions, and prepositions, though, unless they're the first word, should not be capitalized.