Enzyme is bio catalysts that has the ability to increase the rate of the biochemical reactions of the body. Enzyme is specific in nature and requires the optimum pH and temperature.
Enzymes when added with the substrate result in the formation of product with increased speed. The line A of the graph clearly determines that A shows the reaction with enzyme because the line A completes the reaction in less period of time.
line A is the answer because enzymes act as catalyst for chemicals reactions which means that they help speed up the production of products from a chemical reaction