<span>B. Mr. Moon, whom you have met, is my assistant.
The relative clause in this sentence is "</span><span>whom you have met". The relative pronoun used here is the whom.
Relative pronouns are type of pronouns that make use of possessive pronouns, or acts as an object or subject in the sentence.
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Are you talking about Marigolds by Eugenia Collier?
Answer:
d. we come to school by bus
an author's sentence structure