I believe the answer is c :)
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Function of the nucleus<span> is to maintain the identity of genes and to control the activities of the cell, so it is the cell's control center</span>
B. Carefully
Adverbs modify verbs. In this sentence, "approached" is the verb so "carefully" is the adverb.
Answer:
He is the waiter, because he can be made to distribute meals and water twice a day.