The Figure Below Shows the Production Possibilities Frontiers for Rice

The figure below shows the production possibilities frontiers for rice and T-shirts for two countries,Costa Rica and United States.According to the figure below,in Costa Rica,the opportunity cost of 1 ton of rice is: Figure 2.1

A) 1/2 of a T-shirt.
B) 3/4 of a T-shirt.
C) 1 T-shirt.
D) 11/2 T-shirts.
E) 2 T-shirts.