Identify the choice which features a relative clause.
a) the man, whose name i don't recall, told us that we were going the wrong way.
b) as we were walking to the county fair, the man told us that we were going the wrong way.
c) i asked the stranger if we were going the right way, and he told us that we weren't.
d) the stranger told us that we were going the wrong way.

A)The man, whose name I don't recall, told us that we were going the wrong way.  

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)

cavern or cave

i hope this

the second option.is correct