Answer:
the answer is C : Alexander Graham Bell
I agree with what you have the last option because "however" shows opposition which not answering would oppose the previous statement.
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.