Suppose that an individual has a constant MRS of shoes for sneakers of 4:3 (that is, he or she is always willing to give up 3 pairs of sneakers to get 4 pairs of shoes). Then, if sneakers and shoes are equally costly, he or she w1l1:

a. buy only sneakers.
b. buy only shoes
c.spend his or her income equally on sneakers and shoes..
d.wear sneakers only 3/4 of the time