In Economics, Cost Is ________, and Benefit Is ________

In economics, cost is ________, and benefit is ________.

A) what you must give up to get something; what you are willing to give up to get it
B) what you are willing to give up to get it; what you must give up to get something
C) the amount of money that you pay for something; the amount of money that someone else is willing to pay you
D) what you are willing to pay on the margin; what the government pays you when you are unemployed or retired
E) the amount of money that you pay on the margin; the amount of money that you receive on the margin