Industrial accidents are more common when some of the people in safety-sensitive jobs have drinking problems than when none do. Since, even after treatment, people who have had drinking problems are somewhat more likely than other people to have drinking problems in the future, any employer trying to reduce the risk of accidents should bar anyone who has ever been treated for a drinking problem from holding a safety-sensitive job.
Which of the following, if true, most seriously undermines the argument above?
A. Some companies place employees who are being treated for drinking problems in residential programs and allow them several weeks of paid sick leave.
B. Many accidents in the workplace are the result of errors by employees who do not hold safety-sensitive jobs.
C. Workers who would permanently lose their jobs if they sought treatment for a drinking problem try instead to conceal their problem and continue working for as long as possible.
D. People who hold safety-sensitive jobs are subject to stresses that can exacerbate any personal problems they may have, including drinking problems.
E. Some industrial accidents are caused by equipment failure rather than by employee error.
D选项无关，问题说的是不要那些ever been treated for a drinking problem的人，也就是说招聘新人从事 safety-sensitive job时的选择，至于从事这种工作后是否会变成爱喝酒的人，和现在找一个什么样的人来干这种工作无关吧。（题外话：另外，完全有可能在现在从事这种工作的人中，谁出现了这种不良嗜好就不让谁干了，反正劳动力很多的。）
