In any chemical reaction, the quantities that are preserved are O A. the number of moles and the volumes B. the number of molecules and the volumes 0 C. mass and number of atoms D. mass and moles

Explanation:

Law of conversation of mass applies in any chemical reaction.

The number of moles can be different for each compound being used, as it is based on the different molar masses of each compound.

Hence, the answer is C. mass and number of atoms.