Answer is A just took the test.
The <span>word in the sentence does the adjective clause modify is letter (</span>C.) babysitter. Adjective clause functions identically with adjectives that uses the indicators such as the pronouns who, whom, which, and that; or the adverbs where, when, and why.
Take key points and use them in the new speech. Make it short and sweet. Also don't use "big" words. Use words kids can/will understand, or be prepared to define them, explain them, and give an example.