
Passage: Scientists applied desulfurization ash from some power plants to 40 mu of saline-alkali land in Inner Mongolia. As a result, corn and grass grew in this land. The scientists concluded that the desulfurized ash from coal-fired power plants can be used to transform saline-alkali land.
Question: Which of the followings, if true, best supports the scientist's conclusion?
A. A.Corn grown in saline-alkali land modified with desulfurized ash is similar to that of corn in fertile soil.
B. B.The main component of desulfurization ash is gypsum, and the use of gypsum to improve saline-alkali land has a history of more than 100 years.
C. C.The saline-alkali land next to the 40-mu experimental field where no desulfurization ash was applied was covered with gray, and even weeds were rare.
D. D.The content of heavy metals and pollutants in these desulfurization ash did not exceed the national standard.
Answer: