This is a simple sentence because in its entirety it is a single clause. There are no multiple independent clauses connected or any subordinate clauses to make it compound or complex.
Answer:
C. "She should quote the second sentence directly, because it establishes important supporting evidence in a unique way."
Explanation:
I think this one is correct, however I am not positive, it's really just a guess. The first sentence is common knowledge and you shouldn't need to add what the readers already know if it's the main idea. The second sentence isn't necessarily common knowledge and should always be cited.
Hope this helped, let me know if it's right or not.
The russian revolution was indeed a failure
We need a story or the rest of the information to figure out the answer
