One benefit of repeating the self improvement process is that you can
a.
pay lower fees to plan and maintain the new goal
b.
see everything with fresh eyes
c.
use skills and information from previous goals
d.
reduce the time spent improving at work

Your answer would be C

Whitman wanted to express that America is a country constituted by several parts that make a whole that works well. Each individual of the country doing their part is what forms the nation.

A choir is a group of people in which each one has a part to sing that might not be special on their own but form a harmony when they are sung together,