Correct Option: B

Ozone layer, that is, the layer of life-protecting ozone found at the top of the stratosphere. Ozone is formed in the earth’s stratosphere and is critical to life on earth as we know it. There is compelling scientific evidence that ozone is destroyed in the stratosphere and that some human-released chemicals are speeding up the breakdown of ozone in the atmosphere. The appearance of a hole in the earth’s ozone layer over Antarctica, first detected in 1976, was so unexpected that scientists didn’t pay attention to what their instruments were telling them; they thought their instruments were malfunctioning.