Answer:
Your answer would be C.
Step-by-step explanation:
The sentence above contains a compound subject. Compound subjects occur when a sentence has two subjects and these are joined by a coordinating conjunction, such as and, or, neither, or nor. When the subjects are joined by and, the verb agrees with the pronoun they. As this is the case in the sentence above, the verb should be plural. That is why C is the best choice.