Suppose that 2 units of X and 8 units of Y give a consumer the same satisfaction as 4 units of X and 2 units of Y . Then
A.
the consumer is willing to give up 3 units of Y to obtain 1 more unit of X.
B.
the consumer is willing to give up 1 unit of Y to obtain 3 more units of X
C.
the marginal rate of substitution of X for Y is 6
D.
all of the answers are right