please answer

Which of the following statements about price elasticity of demand is true? O A. It is higher for an entire group of related products than it is for a particular product in that group. O B. It is very small when good substitutes are readily available for the commodity. OC. It is greater than one if the percentage increase in the commodity's price is greater than the percentage decline in quantity demanded. O D. It usually increases over time. O E. It is a positive number because price and quantity demanded move in the same direction