The correct option is B Ozone is upper layer of atmosphere is harmful to animals.
Ozone is a naturally occurring gas found in the atmosphere. Tropospheric ozone, found in the lower parts of the atmosphere, is often called "bad" ozone because it can damage living tissue and break down certain materials. "Good" ozone also exists; this is found in the stratosphere, and it acts as a shield absorbing harmful ultraviolet radiation from the sun.