Answer: B. Inelastic when the price changes.
Inelasticity of goods with change in price means such product is a necessity and therefore the demand for such product will remain unchanged irrespective of a change in price. Even if the price is lowered, the demand for that product still remains unchanged. Examples of such products are prescription drugs and petrol. Regardless of a change in price, the demand for petrol or drugs will not change. A reduction in price will lead to less revenue for the company. Therefore, a reduction in price of such goods will not be beneficial in any way to the manufacturer.