D. Independent clause.
It makes sense when its by itself therefore its independent.
Answer:
Mary gave up on her dream because she could not use her hands which were deteriorating.
Explanation:
Answer: Hello! I think your answer D.
Hope this helps.
Answer: You should first determine your position, so the answer choice would be B.
Explanation: You cannot find supporting evidence until you know what position you are writing your thesis about. You cannot find reasons either for the same reason as evidence. Investigating why you have a position must come <em>after</em> determining your position.