question_answer

Out of the following, select those that would help to reduce water pollution. (i) use of sewers for removal of urban waste (ii) use of unleaded petrol in cars (iii) spraying of pesticides on plants (iv) We should not excreate in open.

A)  (i) and (ii)                  

B)  (iii) and (iv)

C)  (i) and (iv)      

D) All of these