Michael Can Produce the Following Combinations of X and Y

Michael can produce the following combinations of X and Y: 10X and 10Y, 5X and 15Y, and 0X and 20Y. Vernon can produce the following combinations of X and Y: 100X and 20Y, 50X and 30Y, or 0X and 40Y. It follows that

A) Michael has the comparative advantage in producing X and Vernon has the comparative advantage in producing Y.
B) Michael has the comparative advantage in producing Y and Vernon has the comparative advantage in producing X.
C) Neither Michael nor Vernon has a comparative advantage in producing X.
D) Neither Michael nor Vernon has a comparative advantage in producing Y.