Question

Which word begins the relative clause in this sentence?

Answer 1

I think the correct answer from the choices listed above is option A. It is "who" that signifies the relative cause in the sentence. Relative clauses are clauses starting with the relative pronouns who*, that, which, whose, where, when. They are most often used to define or identify the noun that precedes them.

Answer 2

The answer to your question would be that the relative clause in the sentence is introduced by the word "who". This is a restrictive or defining relative clause in the sense that the information it provides is considered essential to the meaning of the sentence. If the information in the relative clause was dropped, the meaning of the sentence would be altered.  This relative clause identifies who the person is. Take a:

a) ? Miguel is the person