Joaquim Has New Babies at Home, So He Cares Only

Joaquim has new babies at home, so he cares only about diapers and wipes. Joaquim's preferences are represented by U(D,W) = DW, where D is the number of diapers and W is the number of wipes that Joaquim purchases. Joaquim's preferences can also be represented by this utility function:

A) U(D,W) = D^0.5W^0.5
B) U(D,W) = D^0.5 + W^0.5
C) U(D,W) = D + W
D) U(D,W) = 0.5D + 0.5W