It is best to say that efficient plumbing .reduces water pollution by using less waterb. reduces water pollution by using cleaner waterc. increases water pollution by using more waterd. reduces water pollution by using dirty water

My answer is letter a.reduces water pollution by using less water.  There have been new advancements in plumbing fixtures that make them more efficient in dispensing water.  They are designed to make the most of the water that we consume by using less water.

Where's the pictures ?