With regard to enzymes, what can be said to be the relationship between the substrate and the active site?

Responses
A One substrate can bind to the active site and is changed into products.One substrate can bind to the active site and is changed into products.
B Every active site will always accept multiple substrates in order to produce a new product.Every active site will always accept multiple substrates in order to produce a new product.
C The active site of an enzyme combines with the substrate, when a product is given to the enzyme, producing a new molecule.The active site of an enzyme combines with the substrate, when a product is given to the enzyme, producing a new molecule.
D A specific product fits into the active site of an enzyme. The enzyme then breaks down the product to make a new substrate.

A One substrate can bind to the active site and is changed into products.