The answer is D. Slaves became very popular and started doing the same jobs that farmers did.
I believe it's b) Government depends on the will of the people.
During the Depression, wage cuts and unemployment eventually affected "<span>d. all levels of society," since the economy as a whole began to falter due to a lack of consumer spending. </span>
People think the earth is flat because it seems hard to fathom that you can still stay on the earth if you're on the North Pole. This theory, that the earth is flat, was well known for hundreds of years. The vikings were the first to figure out that the earth is not flat, though Christopher Columbus gets the credit.
Hope this helps! Have a happy holiday!