Which Statement Is TRUE

Which statement is TRUE?

A) The value of the marginal product of labour equals the marginal product of labour times price.
B) The value of the marginal product of labour equals a one-unit change in a factor divided by the change in total revenue.
C) Marginal cost equals change in total revenue divided by the one-unit change in a factor.
D) The value of the marginal product of labour equals the change in the quantity of a factor times the price of the factor.