“When the truck crashed through the train crossing guard, it gave the policemen and firemen a fright” the nouns the "policemen and firemen" constitute a compound predicate nominative.
Thus, the answer is: A. Predicate nominative.
Predicate nominative is actually known to be when the words in sentences that follow a linking verb are seen as nouns or noun phrases and they modify the subject.
We see here that "policemen and firemen" are actually known to be nouns. Noun is known to be any word that gives the name of a person, animal place or thing. The nouns there came after the linking verb "gave".
Thus, the answer is predicate nominative.
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