Answer:
c. Because Cheryl is a farmer, she has very strong opinions about GMOs, but she hasn't shared them with me.
Step-by-step explanation:
A compound-complex sentence is a sentence which is made up of at least two independent clauses, a predicate, verb, and one or more dependent clauses and is separated by a comma or semicolon.
Therefore, from the given answer choices, the choice that is a compound-complex sentence is option C.
This is because, the sentence has more than one independent clause and is separated by commas.