Answer: When you look at the other words in the sentence in order to determine the meaning of a challenging word, you are<u> using context clues.</u>
Explanation: <u>Context clues are words, phrases or clauses that help the reader to figure out the meaning of an unknown word</u>. Generally, these context clues are found in the same sentence in which the difficult word is; however, they may also appear in the following sentences. <u>Two types of context clues are synonyms and antonyms</u>. In that way, the option that completes the sentence provided is "using context clues".