急：求助一道GWD~~！！！

angela19901003

Industrialaccidents are more common when some of the people in safety-sensitive jobs havedrinking problems than when none do.  Since, even aftertreatment, people who have had drinking problems are somewhat more likely thanother people to have drinking problems in the future, any employer trying toreduce the risk of accidents should bar anyone who has ever been treated for adrinking problem from holding a safety-sensitive job.
Which ofthe following, if true, most seriously undermines the argument above?
A.   Some companies place employees who are beingtreated for drinking problems in residential programs and allow them severalweeks of paid sick leave.
B.   Many accidents in the workplace are theresult of errors by employees who do not hold safety-sensitive jobs.
C.   Workers who would permanently lose theirjobs if they sought treatment for a drinking problem try instead to concealtheir problem and continue working for as long as possible.
D.   People who hold safety-sensitive jobs aresubject to stresses that can exacerbate any personal problems they may have,including drinking problems.
E.    Some industrial accidents are caused byequipment failure rather than by employee error.  



选C 不是很明白 谁帮我解释一下呀 非常感谢~~~！！！！！！！！！！！！！！