Correctly label a b c and d enzyme activity ?

Hi

The picture depicts an enzyme mediate reaction.

Enzyme is the proteinaceous substance that increases the rate of chemical reaction by binding to the substrate.

Substrate is the reactant of the reaction which is processed by the enzyme into a product at a faster speed than the normal reaction.

Active site is the specific part of the enzyme where a substrate binds and chemical reaction occurs. it is also known as catalytic site because it contains residues that formulate short term bonding with reactants or substrate molecules and then catalyse the reaction.

Products are the final outcome of an enzymatic reaction which are formed after the completion of reaction and are desired substances from reaction.

Hope it help!