Which of the Following Is True of Marginal Revenue Product $\times$

Which of the following is true of marginal revenue product (MRP) and marginal product (MP) ?

A) MRP = MP $\times$ price, whether the firm is a price searcher or not.
B) MRP = MP $\times$ price only if the firm is a price searcher.
C) MRP = MP $\times$ price only if the firm sells in a perfectly competitive market.
D) MRP = MP $\times$ marginal cost only if the firm is a price searcher.
E) MRP = MP/price only if the firm is a price taker.