With reference to sources of water pollution, which of the following is/are true?

Q. With reference to sources of water pollution, which of the following is/are true?

1. Natural sources

2. Domestic sources

3. Agricultural sources

4. Industrial sources

Select the correct answer from the following codes

a. Only 4

b. Only 2, 3 and 4

c. Only 3 and 4

d. 1,2, 3 and 4

Answer: 1,2, 3 and 4