An indifference curve is negatively-sloped because: A) utility is a s

An indifference curve is negatively-sloped because:

A) utility is a subjective concept.
B) as the consumer obtains additional units of one good, the consumer is willing to sacrifice increasing amounts of the other good.
C) in order to remain at the same level of utility, if an individual gets more of one good, he must sacrifice some of the other good.
D) marginal utility is constant along an indifference curve, and increases in the consumption of one good cause the price of that good to fall.

ANSWER

C