According to the Law of Diminishing Marginal Returns

According to the law of diminishing marginal returns:

A) as more units of a fixed input are added to a variable input in the long run, the additional output produced by each additional unit of the fixed input will eventually decrease
B) as more units of a variable input are added to a fixed input in the long run, the additional output produced by each additional unit of the variable input will eventually decrease
C) as more units of a fixed input are added to a variable input in the short run, the additional output produced by each additional unit of the fixed input will eventually decrease
D) as more units of a variable input are added to a fixed input in the short run, the additional output produced by each additional unit of the variable input will eventually decrease