Select the letter of the term that correctly identifies the function of

the word or phrase in parentheses in the following sentence:
Many collectors find geodes fascinating (rocks) for study.
a. direct object
b. indirect object
c. object complement
d. predicate nominative
e. predicate adjective

c. object complement

The function of the word "rocks" in parentheses in the sentence "Many collectors find geodes fascinating (rocks) for study" is c. object complement.