Explanation:

- Ozone is a molecule composed of oxygen atoms.

- It is represented chemically as O3.

- Each molecule of ozone contains three oxygen atoms bonded together.

- Option:1, One—suggests there is only a single oxygen atom, which is incorrect.

- Option:2, Four—claims there are four oxygen atoms, which is inaccurate for ozone.

- Option:3, Two—indicates two oxygen atoms, however, this is the case for dioxygen (O2), not ozone.

- Option:4, Three—accurately describes an ozone molecule with three oxygen atoms.