Which one of what? You don't say the choices:)
Answer:
C. Context clues
Explanation:
Context clues are <em>hints found within </em>a sentence, paragraph, or passage that a reader can use to understand the meanings of new or unfamiliar words. Context clues can also take the form of synonyms, antonyms, word-structure clues, comparisons (such as metaphors and similes), and contrasts.
It’s the second third and last box
The singer, who was very talented, knew the words to the song.
