Which of the following can be used to calculate the price elasticity of demand?

• A.\(\frac{\text{percentage change in quality demand}}{\text{percentage change in price}}\)
• B.\(\frac{\text{percentage change in price}}{\text{percentage change inquantity demand}}\)
• C.\(\frac{\text{percentage change in quality demand}}{\text{percentage change in income}}\)
• D.\(\frac{\text{percentage change in income}}{\text{percentage change in quantity demand}}\)