Why aren't people willing to actually use recycled water more according to the audio?

A) Because the publicity of recycled water is not in place.

B) Because people don't know enough about circulating water.

C) Because circulating water used to be waste water, which makes people feel sick.

D) Because people don't have a full understanding of waste water.

E) Because it is difficult for people to overcome the disgust caused by circulating water.