Compute the marginal revenue when the price elasticity of demand is −0.25.
A. −3P, meaning marginal revenue is negative and 3 times greater than price.
B. 3P, meaning marginal revenue is positive and 3 times greater than price.
C. −0.33P, meaning that marginal revenue is negative and one-third of the price.
D. −0.25P, meaning that marginal revenue is negative and one-fourth of the price.