The answer is A , Linking
Predicate nouns and predicate adjective are both called SUBJECT COMPLEMENTS.
A subject complement is a noun or an adjective that follows a LINKING VERB that restates the subject. A linking verb is a verb that acts as an equal sign, the subject is or becomes the object.
Examples:
Mary is my friend. (Mary = friend), friend is a predicate noun.
Mary was elected class president. (Mary > president), president is a predicate noun.
The soup was too hot. (soup = hot), hot is a predicate adjective.
My shoes got scuffed in the gravel. (shoes > scuffed), scuffed is a predicate adjective.
