Answer: The symbol is the sun, and its meaning is hope.
Explanation: I just took the quiz on K-12 and reviewed it making sure it was correct!
B. Hydroelectric.
(Edit: Why did you ask the question if you had the answer?)
I am loath to close. We are not enemies, but friends. We must not be enemies. Though passion may have strained it must not break our bonds of affection. The mystic chords of memory, stretching from every battlefield and patriot grave to every living heart and hearthstone all over this broad land, will yet swell the chorus of the Union, when again touched, as surely they will be, by the better angels of our nature.