Final answer:
To rewrite sentence (b) so that it means the same as sentence (a), you can say: Water overuse should be stopped by people.
Step-by-step explanation:
To rewrite sentence (b) so that it means the same as sentence (a), you can say:
b) Water overuse should be stopped by people.
This sentence maintains the same meaning as sentence (a) by expressing the idea that people need to take action to stop water overuse. By rephrasing the sentence in this way, the subject and verb are still present, but the sentence structure has been changed slightly.