The Following Questions Refer to the Graph Below

The Following Questions Refer to the graph below.
-Without trade,the Republic of Alpha's production possibilities curve is AB.For Alpha to be willing to trade milk for bread,a million loaves of bread would have to cost less than

A) 0.5 million gallons of milk
B) 1 million gallons of milk
C) 2 million gallons of milk
D) 0.5 million loaves of bread
E) Alpha would not trade milk for bread