Use of the Midpoint Method to Calculate the Price Elasticity

Use of the midpoint method to calculate the price elasticity of demand eliminates the problem of computing:

A) different elasticities, depending on whether price decreases or increases.
B) different elasticities, because price and quantity are inversely related on the demand curve.
C) total revenue when price falls and demand is inelastic.
D) total revenue when price falls and demand is elastic.