I don'T know which will be correct. help me in choosing the right one. A condition for the profit-maximizing use of any factor of production is (where MP = marginal product, w = the price of a factor of production, p = price of one unit of the firm's output, MR = marginal revenue, MC = marginal cost, MRP = marginal revenue product):

a.MRP = MP p

b.MR =

c.MC = MR w

d.w = MP p

e. MRP = MR MC