Which layer of the atmosphere contains Ozone Layer?

The correct option is Stratosphere.

Step-by-step explanation:

1. The Earth's atmosphere is divided into five primary layers: the Troposphere, Stratosphere, Mesosphere, Thermosphere, and Exosphere.

2. The Troposphere is the lowest layer where weather phenomena (like rain, cloud formation, and wind) occur.

3. The Stratosphere is the second major layer of the atmosphere, situated directly above the troposphere, extending from about 12 km to 50 km (7.5 to 31 miles) above the Earth's surface.

4. The Ozone Layer (composed of ozone, $O_3$) is situated mainly within the lower portion of the stratosphere, approximately between 15 km and 35 km altitude.

5. The main function of the ozone layer in the stratosphere is to absorb harmful ultraviolet (UV-B and UV-C) radiation emitted by the Sun, thereby protecting life on Earth.

Therefore, the atmosphere layer containing the ozone layer is the Stratosphere.