Holding Other Things Constant, Diminishing Marginal Productivity Eventually Happens To

Holding other things constant, diminishing marginal productivity eventually happens to:

A) any input as more of the input is used.
B) labor as more is used, but not to land or capital.
C) capital inputs as more is used, but not to labor or land.
D) all inputs, with the exception of land as more of those inputs are used.