Answer: C) Compound-complex.
Explanation: a compound sentence is formed by two or more independent clauses (phrases with subject and predicate that make complete sense on their own). A complex sentence is formed by an independent clause and a dependent clause (a phrase that doesn't have complete meaning on its own). The given sentence has a dependent clause (Before he started to watch TV) and two independent clauses ("he made sure that he had all of his favorite snacks (ice cream and chips)" and "he made sure to get all of his homework finished") so it is a compound-complex sentence.
