If with 1 hour of labor time, nation A can produce either 3X or 3Y, while nation B can produce either 1X or3Y (labor is the only input) :
选项:
A:
nation A has a comparative disadvantage in commodity X.
B:
nation B has a comparative disadvantage in commodity Y.
C:
nation A has a comparative advantage m commodit
D:
nation A has a comparative disadvantage in neither commodity.