Read the excerpt from "An Indian's View of Indian Affairs."

We were taught to believe that the Great Spirit sees and hears everything, and that he never forgets; that hereafter he will give every man a spirit-home according to his deserts: if he has been a good man, he will have a good home; if he has been a bad man, he will have a bad home.

What central idea of the speech is illustrated by this excerpt?
a) Man should act cautiously because the Great Spirit is not very forgiving.
b) The way a man chooses to live his life directly affects the quality of his life.
c) A man will have a much more lavish home if he is good to those around him.
d) Only those who are good to others will eventually receive a spirit-home.