When a chemical reaction occurs, OA) the atoms involved remain the same
B) the molecules involved remain the same
C) the atoms arrange themselves into new kinds of molecules
OD) the substances before and after are the same

C) the atoms arrange themselves into new kinds of molecules

Explanation:

To prove that a chemical reaction occurs, the atoms arrange themselves into new kinds of molecules.

Chemical reactions involves bond re-arrangement to give a new set of bonds in the products.

d. they are naturallyoccuring inorganic fuels like coal and petroleum.