Option B
Explanation:
A reactant is a substance that take act as raw material for any chemical reaction. ย
Catalyst is a substance that helps in either increasing or decreasing the rate of any chemical reaction without themselves physically taking part in any chemical reaction.
Enzyme is also a catalyst . It is in general a bio catalyst. ย
The final substance produced in any chemical reaction is known as product. ย
For example - ย
Sugar(maltose) is converted into glucose in the presence of maltase enzyme
Here โ sugar (maltose) is reactant
Glucose is product ย
And maltase enzyme is catalyst. ย