Which of the following statements about eutrophication is/are correct? (i) It increases the amount of sunlight reaching the bottom of the water body. (ii) It occurs due to excessive enrichment of the water in river and lakes. (iii) It results in decrease in water clarity, dissolved oxygen and aquatic life.

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