请英语阅读高手帮我做道选择题,

请英语阅读高手帮我做道选择题,
For their part,philosophers may be hardly less nettled when scientists claim for science,and for scientific knowledge,an intellctual authority that for more than 250 years has been known to be logically untenable.I allude here only in passing to the doctrine that science has conclusive or unimpeachable authority.Few now think this.But what many defenders of science do think is that science verges on the indubitable.The results of science are not certain,it is agreed,but they come close;they are not irrevocablly proved by observation and experiment--that asks too much--but they are overwhelmingly supported by observation and experiment.
Defenders of science think that_____.
A.science is beyond any doubt
B.science has conclusive anthority
C.science doen't have conclusive authority
D.all the scientific results are proved by observation and experiment
应该选哪个?()
最好希望高手们能翻译一下,给出每个答案是对是错的理由.

C.science doen't have conclusive authority
细看这句：But what many defenders of science do think is that science verges on the indubitable.The results of science are not certain,