What is a chemical reaction?

a. a process of bonding substances together

B. a process that leads to have filled valence shells

following the octet rule

C. a process that releases or consumes energy

D. all of the choices

A chemical reaction is defined as per encyclopedia Britannia as a "a process in which one or more substances, are converted to one or more different substances, the products."

So A is correct, B is correct, C is correct.

So that means we choose D as they're all correct.

D.

Explanation:

this is because in a chemical reaction all 3 of those work.