Read the following statements carefully and select the correct option. I. UV-rays are essential f...

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Read the following statements carefully and select the correct option.
I. UV-rays are essential for the production as well as degradation of ozone gas.
II. Ozone present in ionosphere acts as a shield absorbing UV-radiations coming from the sun.
III. One fourth of the incoming solar radiation is reflected by the atmospheric gases and clouds and only half of the incoming solar radiation falls on the earth's surface, heating it. Of this only a small proportion is reflected back.
(a) I and II
(b) I and III
(c) II and III
(d) I, II and III

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