20) 20 18 Total Revenue ADOONTO TR N 0 2 5 6 8 9 10 Quantity Demanded Suppose the total-revenue curve is derived from a particular linear demand curve. That demand curve must be 20) A) elastic for price increases that reduce quantity demanded from 4 units to 3 units. B) inelastic for price declines that increase quantity demanded from 2 units to 3 units. C) elastic for price declines that increase quantity demanded from 5 units to 6 units. D) inelastic for price increases that reduce quantity demanded from 4 units to 3 units