Aubrey buys only apples and peaches. In June, apples sell for $2 each and peaches sell for $1 each. In July, apples sell for $1 each and peaches sell for $2 each. Aubrey's income is $20 in June and $20 in July.
a. True or False: If Aubrey is equally happy in both months, then she surely eats more apples in July.
b. True or False: If Aubrey buys exactly eight apples in June, then she is certainly happier in July.
c. True or False: If Aubrey buys exactly eight apples in June, then she certainly buys more than eight apples in July.