Answer:
The reactants are called D. substrates.
Step-by-step explanation:
The compound which catalyze the biochemical reaction is called enzymes. The enzymes does not involve in changing the properties of the chemical reaction as it only increases the reaction rate. This enzymes and reactants are bounded with the help of the enzyme’s substrate which are reactants that promote the chemical reaction.
The substrate are formed into products and the location where the reactants and substrates bind are called active site.