The responsiveness of the quantity demand of a commodity to change in the consumer’s income, measured by the proportionate change in quantity divided by the proportionate change in income ?

The responsiveness of the quantity demand of a commodity to change in

1.	The responsiveness of the quantity demand of a commodity to change in the consumer’s income, measured by the proportionate change in quantity divided by the proportionate change in income ?
A.	Elasticity of demand
B.	Import substitution
C.	Income elasticity of demand
D.	None
Answer» B. Import substitution