Which of the following agricultural practices have been primarily responsible for pollution of our water resources?
1. Use of live-stock manure
2. Use of chemical fertilisers
3. Excessive use of chemical pesticides
4. Deforestation

A. 2 and 3

B. 1, 3 and 4

C. 1 and 2

D. 1, 2 and 4

Answer: Option A