Section: Logical Reasoning

31) There are no edible fish in the streams of this county because there are no pesticide controls.

Which one of the following assumptions must be made before the conclusion above can be reached?

1. Edible fish cannot be found in areas where there are no pesticide controls.
2. If there are pesticide controls, there will be many edible fish.
3. Without adequate pesticide controls, the fish population will rapidly decline.
4. If there are pesticide controls, there will be some edible fish.
5. With pesticide controls, the fish population will rapidly increase.

The assumption is that where there are no pesticide controls, no edible fish can be found, not the reverse as in (B), (D), and (E).