My mom was a proud parent when she reviewed my midterm grades. what is the function of the capitalized word in the sentence?

Choices:
A.) subject 

B.) direct object 

C.) predicate nominative 

D.) indirect object

letter C.) predicate nominative 
> Predicate Nominative are nouns followed by a linking verb that stands for the subject.
The word PARENT is a noun that restates the subject "mom". 
> predicate nominative renames the subject and is considered as a "completer" or "compliment" as it completes the verb [linking verb].