Penny buys 3 bouquets of flowers for $3 each and 4 bouquets for $2 each. Which expression gives the total cost of the bouquets that Penny buys?
A.
3 /3 + 4 /2
B.
3 /3 + 2 /4
C.
3 /3 + 4 × 2
D.
3 /2 + 4 × 2
(The / means that there is a exponent)