| Which of the following activities makes the river water dirty? |
| 1. Washing clothes in river |
| 2. Throwing garbage in river |
| 3. Burning fuel near the river |
| 4. To cut down the trees surrounding a river |
A) Only 1
B) 2, 3 and 4
C) 1 and 2
D) 3 and 4
Correct Answer: C
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