一个关于钻井平台的逻辑题，想问C是否是无关项？

yangzhao2003xm

Q3.
Offshore oil-drilling operations entail an unavoidable risk of an oil spill, but importing oil on tankers presently entails an even greater such risk per barrel of oil.  Therefore, if we are to reduce the risk of an oil spill without curtailing our use of oil, we must invest more in offshore operations and import less oil on tankers.

Which of the following, if true, most seriously weakens the argument above?

(A) Tankers can easily be redesigned so that their use entails less risk of an oil spill.
             有关系的延伸信息
(B) Oil spills caused by tankers have generally been more serious than those caused by offshore operations.
(C) The impact of offshore operations on the environment can be controlled by careful management.
(D) Offshore operations usually damage the ocean floor, but tankers rarely cause such damage.无关，无关联的信息
(E) Importing oil on tankers is currently less expensive than drilling for it offshore