Refer to the table below. Based on their comparative advantage, Martha should specialize in _ while Julia should specialize in _.

Refer to the table below. Based on their comparative advantage, Martha should specialize in _ while Julia should specialize in _.
A.pies? cakes
B.cakes? pies
C.neither pies nor cakes? both pies and cakes
D.both pies and cakes? neither pies nor cakes
正确答案：pies? cakes