Shallow understanding from people of good will is more frustrating than absolute misunderstanding from people of ill will. what is the author’s purpose for including this sentence?
a. to condemn the insincerity of his critics’ adviceb)to contrast the motivations of people in powerc)to explain the need for mutual understanding
d. to criticize people who treat others cruelly

The first alternative is correct (A).

The passage narrates the speech of a person frustrated by the indifference in the personal treatment by people of good will. The complaint consists of the superficiality or the little attention given to his/her questions. That is, it is a criticism of the shallow advice he/her receives from these people. If they went deeper into the issues, they would give clearer and more objective advice.

many were disgusted, nauseated and shook their heads with disapproval upon finding out about the recycling of water process. however, they do not seem to understand that this process actually saves water.

although individuals may argue that it is unhealthy, and or unsafe to drink water that is "from toilet to tap" , the water is 100% safe to drink and involves forcing the water across a membrane, which "removes   any impurities, including viruses, pharmaceuticals and dissolved minerals" , according to paul rozin, a psychology professor who studies revulsion.

i agree that that the thought of drinking water that once ran through someones kitchen sink isn't quite appealing, but recycled wastewater is safe to drink. it also saves water. "the city produces nine million gallons a day" claims russell schreiber, the city’s director of public works.

recycled waste water has absolutely no health concerns whatsoever. when wastewater goes into a system, it's absorbed back into the ground. thus, it goes into a sewer system, then goes through a treatment process that removes contaminants before being released. nonetheless, there is no problem in drinking water that has been recycled.

"in drought-ed california, there are six state agencies that use wastewater that comes from an intellectual property source," according to the university of california, riverside. studies show that this water is completely safe to drink, however, it still doesn't mean people are going to happily pour it in a water glass.

researchers hope it "may make consumers more amenable to drinking recycled wastewater," extraordinarily, women who have a higher "disgust reaction" and make most consumer purchasing decisions.