Read the following statements. (i) Air dissolved in water cannot be removed from it. (ii) Density of air decreases with increasing altitude. (iii) Air is an element that surrounds the Earth and makes it hospitable for living organisms. (iv) Air helps in pollination of several flowers and in the dispersal of seeds. Which of the above statements are correct?

• A. (i) and (ii) only
• B.        (ii) and (iv) only          
• C.        (i) and (iii) only           
• D.        (iii) and (iv) only