Agnes can produce either 1 unit of X or 1 unit of Y in an hour, while Brenda can produce either 2 units of X or 4 units of Y in an hour. There can be gains from exchange
A) only if Brenda becomes faster at producing X or Y.
B) if Agnes specializes in the production of Y and Brenda in X.
C) only if Agnes becomes faster at producing X.
D) if Agnes specializes in the production of X and Brenda in Y.
Answer: D