Concept:Price elasticity of supply measures how responsive the quantity supplied is to a change in price.
Explanation:If the quantity supplied stays constant, then the percentage change in quantity supplied is zero.
The formula for supply elasticity is:
Es=% change in price% change in quantity suppliedSince the quantity supplied does not change at all:
Es=% change in price0=0An elasticity value of zero means that changes in price produce no change in quantity supplied.
This is the definition of perfectly inelastic supply.
Therefore, the supply curve is vertical, and sellers supply the same amount at every price.
Answer:D. perfectly inelastic