Most likely d from your choices because its quick to write and to the point
People take their own time to do everything like taking a shower, the soap and water get mixed and might go straight to the sea and infect the water.
And people also waste water by throwing water everywhere when they don't need.
The main idea is what something is mostly about. Main ideas are typically found in a literary passage. Central ideas are found in an informational text. The theme is the lesson or message that the writer wants to get across in his or her story.
Is there no like multiple choice or more context
