Which of the following methods can be used to control water pollution? (i) Avoiding the use of chemical substances freely. (ii) Educating society about the dangers of water pollution. (iii) Using biological control in agricultural areas instead of using pesticides.

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