The most accepted argument in favor of market economies is their efficiency. the argument most accepted in favor of command economies is the belief that they are
a more efficient
b more traditional
c more religious
d more fair

The argument most accepted in favor of command economis is the belief that they are fair in a way - d.

Command economies rely on the assumption that when the government or the reuling bodies decide on the production, the end result will be a society which is more fair.