Which of the following statements is/are correct? I. Water vapour in the atmosphere decreases with altitude. II. It increases from equator towards the poles. III. About 90% of atmospheric water vapour lies below 6 km. IV. It preserves earth's radiated heat.

Which of the following statements is/are correct? I. Water vapour in t

1.	Which of the following statements is/are correct? I. Water vapour in the atmosphere decreases with altitude. II. It increases from equator towards the poles. III. About 90% of atmospheric water vapour lies below 6 km. IV. It preserves earth's radiated heat.
A.	I, II, III???
B.	I, III, IV
C.	I, II, III, IV
D.	II, III, IV
Answer» C. I, II, III, IV