The midpoint method is used to calculate elasticity because it automatically computes a positive number instead of a negative number. This results in an elasticity that is the same as the slope of the demand curve. Why is the midpoint method preferred for calculating elasticity?A. It automatically computes a positive number.B. It automatically computes a negative number.C. It results in an elasticity that is the same as the slope of the supply curve. D. It results in an elasticity that is the same as the slope of the demand curve.