What is ozone composed of?

Ozone is composed of three oxygen atoms, which is the reason why the choice indicating three oxygen atoms is the correct answer. This molecular structure is represented as O₃, signifying that each molecule consists of three oxygen atoms covalently bonded together.

The presence of three atoms instead of two is crucial, as diatomic oxygen (O₂) consists of just two oxygen atoms and is the form most commonly found in Earth's atmosphere. The unique three-atom arrangement of ozone contributes to its distinct properties and its role in absorbing the majority of the sun's harmful ultraviolet radiation, thus playing a vital role in protecting living organisms on Earth.