The earth receives only two billionth part of the total solar radiation emitted by the sun. The probable causes are I. Large distance of the earth from the sun. II. Small size of the earth as compared to sun. III. Empty space between the sun and the earth. IV. The gaseous mass surrounding the earth.

• A. Statement I, II and III are correct.
• B. Statement II, III and IV are correct.
• C. Statement I and II are correct.
• D. Statement III and IV are correct.