Select the entire correct adjective clause for the sentence below. then select which word is modified by the clause.
terry still carries the knife that his dad gave him.

An adjective clause functions as an adjective, that is, it gives some information about a noun in a sentence (or a pronoun) ( information which is not an action).

The noun modified here is "knife" and the information about the knife, that is the complete adjective clause is " that his dad gave him. "