Marginal Product of Labour Is the Increase in Total Product

Marginal product of labour is the increase in total product that results from a

A) one-unit increase in the quantity of labour employed, other inputs remaining the same.
B) one-unit increase in the quantity of fixed inputs employed, holding the quantity of the variable inputs constant.
C) one-unit increase in both the quantity of variable and fixed inputs.
D) change in the cost of labour.
E) 1 percent change in the quantity of labour and the quantity of capital employed.