Country A is producing 4 units of X and 8 units of Y and country B is producing 4 units of X and 6 units of Y. The opportunity cost of producing more of
A) good X is the same for both countries.
B) good Y is the same for both countries.
C) good X is lower in country A.
D) good Y is lower in country A.
It says the answer is D but could someone explain why because I thought it was C.