Context clues are when you:
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a. predict an outcome from a title.
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b. can't pronounce certain words.
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c. don't know every word in a passage.
d. miss important ideas in a passage.

C. If you don't know every word in a passage.

Explanation:

Readers use information from text to decipher unfamiliar words. They examine clues from the selection to define words and phrases. Context refers to the words that come before and after a word. Sometimes when an author is introducing a concept, she will use synonyms to help readers make connections.