In which sentence below is the underlined word a predicate nominative?
a. carmen is very interested in science, especially biology and anatomy. (interested being underlined.)
b. carmen plans to pursue a career as a doctor. (career being underlined)
c. carmen is a volunteer at the local hospital. (volunteer being underlined)

c. Carmen is a volunteer at the local hospital. (Volunteer being underlined)

Explanation:

Predicate nominatives are predicates that complement the verb that is being used, in this case the word volunteer, which is complementing the linking verb "be" conjugated as "is" is describing and giving a further meaning to the verb is, by adding the fact that she is a volunteer.

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