O O Suppose that when the price of cigarettes decreases by 20 percent, the quantity demanded increases by 10 percent. The price elasticity of demand for cigarettes is , making cigarettes an product (in this example). O a. 2.0; elastic O O b. 0.5; inelastic O O O c. 1.7; inelastic O O d. 0.6; elastic O O e. 1.7; elastic O