Select the letter of the choice that identifies the function of the word

or phrase in quotes in the following sentence:
"Some" of the most interesting fossils are the remains of animals called
trilobites.
a. simple subject
b. simple predicate
c. complete subject
d. complete predicate

c. complete subject

The function of the word "some" in the sentence is to modify the subject "fossils."

Therefore, the correct answer is:

a. simple subject