The Relationship Between Marginal Revenue and Elasticity Is

The relationship between marginal revenue and elasticity is

A) that total revenue equals zero at the quantity for which the demand is unit elastic.
B) whenever the elasticity is negative, marginal revenue is positive.
C) whenever the elasticity is positive, marginal revenue is positive.
D) when demand is elastic, marginal revenue is negative and when demand is inelastic, marginal revenue is positive.
E) when demand is elastic, marginal revenue is positive and when demand is inelastic, marginal revenue is negative.