Answer:
C. President Hoover did not respond effectively to the economic depression.

In the English language, the word "who" is almost always used as a pronoun.
It represents a person, similar to the words "I" and "me".
I believe that distance plus sound equals the sound pressure level, but i could be wrong
History repeats itself a lot in our everyday lives, the reason for that is because it reminds us how things were back in olden days, and get repeated in the future, We learn new things every day because of history, without history, we would be nowhere
Most transitions are going to be Two Paragraphs! I took college English and my professor wanted us to change topics/ideas every 2-3 paragraphs :)