Answer:
A) The man, whose name I don't recall, told us that we were going the wrong way.
Step-by-step explanation:
A relative clause is a dependent clause that modifies a noun. The clause whose name I don't recall is modifying the noun "man", so it is a relative clause.
A relative clause is introduced by a relative pronoun, a relative adverb, or a zero relative.
The clause whose name I don't recall is introduced by the relative pronoun whose.
The clause whose name I don't recall is set off by commas because it is a nonrestrictive clause (i.e. a clause that contains nonessential additional information)