According to the following graph, at point B, The consumer's income is $1,200.

A. the consumer will receive more Y for each unit of X exchanged in the market than at point A.
B. the rate at which the consumer is willing to substitute X for Y is greater than it is at point A.
C. the consumer is willing to give up more Y in order to gain an extra unit of X than at point A.
D. both a and b 
E. all of the above

Answer: E