As California scrambles for ways to cope with its crippling drought and the mandatory water restrictions imposed last month by Gov. Jerry Brown, an array of ideas that were long dismissed as too controversial, expensive or unpleasant are getting a second look. One is to conserve more water; another is to turn nearby and abundant sources of water, like the Pacific Ocean, into drinking water through desalination. Yet another is to recycle the water Californians have already used. And therein lies a marketing challenge that can be even greater than the technological one

–"Water Flowing from Toilet to Tap
May Be Hard to Swallow,”
John Schwartz

Which statement best summarizes the claim the author makes in the excerpt?

People actually love drinking recycled wastewater.
Wastewater is not easy to purify, but it is necessary for survival.
California is facing a drought that has greatly affected the water supply.
Convincing people to drink recycled water is a more difficult task than producing it.

D) Convincing people to drink recycled water is a more difficult task than producing it.

Hence, this statement best summarizes the claim the author makes in the excerpt. Again, option D is correct.

Explanation:

Edge2021 :D

question - in 1827, john walker, a druggist in a small english town, tipped a splint with sulphur, chlorate of potash, and sulphid of antimony, and rubbed it on sandpaper, and it burst into flame. the druggist had discovered the first friction-chemical match, the kind we use to-day. it is called friction-chemical because it is made by mixing certain chemicals together and rubbing them. although walker's match did not require the bottle of acid, nevertheless it was not a good one. it could be lighted only by hard rubbing, and it sputtered and threw fire in all directions. in a few years, however, phosphorus was substituted on the tip for antimony, and the change worked wonders. the match could now be lighted with very little rubbing, and it was no longer necessary to have sandpaper upon which to rub it. it would ignite when rubbed on any dry surface, and there was no longer any sputtering. this was the phosphorus match, the match with which we are so familiar. according the paragraph what was the benefit of the new phosphorus match? it burst into flame when rubbed on sandpaper. it was made by mixing chemicals. it could be ignited on any dry surface. it threw fire in all directions.

answer - matches required natural chemicals