Answer: (Detailed Solution Below)
Option C: Stratosphere
Detailed Solution:
The correct answer is “Stratosphere”.
The ozone layer is located in the stratosphere, which is the layer of Earth's atmosphere that begins about 10–16 kilometers above the surface and extends up to about 50 kilometers altitude. The ozone layer is the region of the stratosphere with the highest concentration of ozone, and is found between 15–35 kilometers above Earth.