The determinants of the capital demand are the price have to be paid to obtain the capital good (the purchasing price of a specific piece of capital), the marginal revenue product received by having it (its expected marginal revenue product), the operating costs of it (the expected cost of its use), the price we could receive eventually by selling the same machine (its selling price) and the interest rate. However, the ratio of the marginal product of capital to its price is not one of them. The correct answer is C.