Answer: I believe it is the last line
Explanation:
In compound sentence, there are two independent clauses that are joined using a coordinator. While in complex sentence, there are two or more clauses with one essentially an independent clause while there can be on or more dependent clauses. The difference between compound and complex sentence is that there is no dependent clause in compound sentence and at least there is one dependent clause in complex sentence.
They are called editers and volunteers
The compound verb is earned good grades.
A best supports the argument because it is the only answer that describes the pros of having mice as pets, while the others provide tips and facts upon adopting them.