Given:
![CO_2](https://img.qammunity.org/2021/formulas/geography/college/8rfqwtr8lsp8obaoux3dii22fdxplsrc4f.png)
, the
![_2](https://img.qammunity.org/2021/formulas/mathematics/college/5tyj90218jv3xxbu12jq4z0emkicc3mr85.png)
is:
A. a coefficient that represents the number of oxygen atoms in the molecule.
B. a subscript that represents the number of oxygen atoms in the molecule.
C. a coefficient that represents the number of carbon dioxide molecules.
D. a subscript that represents the number of carbon dioxide molecules.