Concept:Price elasticity of supply measures how quantity supplied responds to a price change, using Es=%ΔP%ΔQs.Explanation:Original price P0=N15.00 and new price P1=N13.50.Change in price =N13.50−N15.00=−N1.50.Percentage change in price =15.00−1.50×100=−10%.Quantity supplied decreases by 20%, so %ΔQs=−20%.Elasticity of supply: Es=−10%−20%=2.00.Since the value is greater than 1, supply is elastic.Answer:A. 2.00