Which of the Following Formulas Calculates Price Elasticity of Demand

Which of the following formulas calculates price elasticity of demand?

A) ln (1 + % change in quantity sold) / ln (1 + % change in price)
B) (1 + % change in quantity sold) / (1 + % change in price)
C) % change in quantity sold / % change in price
D) ln (1 - % change in quantity sold) / ln (1 - % change in price)