The statement is complete subject, as it is written "Some" of the most interesting fossils are the remains of animals called trilobites.
What is a complete subject?
All of the keywords used to determine the subject of a sentence are referred to as a complete subject. Who or what is "doing" the verb, along with any modifiers, is the whole subject.
Complete Subject Illustrations Limping along the lane was the old, ragged dog. The word "dog" is "doing" the verb "limped" in this sentence.
Thus, option C is correct.
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