What are the roles of hydrogen peroxide, oxygen, hydrogen, and catalase in the following chemical reaction?
catalase: 2h2o2 --> 02 + 2h2o

a. catalase is an enzyme, o2 and h2o are substances, and h2o2 is a reactant.
b. catalase is a substrate, o2 and h2o are products, and h2o2 is an enzyme.
c. catalase is a substrate, o2 and h2o are products, and h2o2 is an enzyme.
d. catalase is an enzyme, o2 and h2o are products, and h2o2 is a substrate.