Consider the following statements regarding depletion of the ozone layer:1. Excessive release of chlorine and bromine in the environment from man-made compounds, such as chlorofluorocarbons.2. Occurrence of certain natural phenomena such as sunspots, and stratospheric winds.3. Degradation of materials by ultra-violet radiation4. Major volcanic eruptions.Which of the above can be categorized as causing ozone depletion?

• A. 1, 2 and 3 only
• B. 1, 3 and 4 only
• C. 1, 2 and 4 only
• D. 2, 3 and 4 only