Answer:
affect is an impact on or an influence, effect is a noun, showing the result or outcome of something.
D. The convertible can not have feelings of it's own, Thus the answer is personification. .
I agree with the person above - I believe the correct answer is A. serenity.
Thoreau was a transcendentalist, which means that he wrote about nature quite a lot. He believed that people should return to living in nature and escape from the concrete cities they were surrounded with in order to find their true selves once again. His description of the pond during the night and day creates a serene and peaceful picture one could relax to.