Which of the following conditions shows the polluted environment?
| a. | pH of rainwater is 5.9 |
| b. | Amount of carbon dioxide in the atmosphere is 0.03% |
| c. | Biochemical oxygen demand 10 ppm |
| d. | Eutrophication |
Choose the correct option
1. (a, b, c)
2. (b, c, d)
3. (c, d)
4. (a, b, d)
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