Answer:
It"s Etymology
Explanation:
Etymology is the study of words
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"On the other hand," is a typical transition that shows a relationship between two ideas. It shows contrast.
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A; it mentions in the second sentence that he hadn't slept two consecutive hours due to dreams. He kept trying to get back to sleep near the end of the story, so that would be the main conflict.
The first one since it uses the Oxford comma.