<span>Your answer would be B. :)
It is a form of a verb that is used in a sentence to
modify a noun, noun phrase, verb, or verb phrase, and then plays a role
similar to an adjective or adverb. It is one of the types of nonfinite
verb forms.</span>
I belive the answer is B. When the man fixed our tire, he found a nail inside, though there didn't seem to be a mark on the outside. Hope it helps!
Noun function: Subject
Pronoun class: D<span>emonstrative </span>