Answer:
When the Civil War drew to a close President Lincoln changed his rhetoric because he needed to prepare to repair the nation after the devastation of the Civil War. After being re-elected, he had to re-build the nation.
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.
I'm going to say B, because she felt to smart for them, office classes tend to be advanced.