Received a PM.
What's the source of this question?
So I see people have narrowed it down to B, C or D and that's why I'm only going to discuss these three options.
The argument goes as follows:
- accidents are more frequent when people in the safety business have drinking problems
- people who've had drinking problems stand a greater chance of have drinking problems in the future
- in order to reduce the risk of accidents, employers must not hire anyone who has been treated for drinking issues
B is definitely out because it does not touch on the issue of "people with drinking problems". The argument specifically discusses reducing risk of accidents as a result of having fewer employees with a history of alcohol abuse. In this respect, B is somewhat like A: it's an issue that's parallel to the argument itself.
OK so C presents an issue with such an unforgiving policy, i.e. not hiring anyone who's had treatment: this creates an incentive for people with issues to lie. If such a policy were not in place, then people might seek treatment and therefore fewer people with drinking problems will be on the job. However, if you make it clear that anyone who's been treated before is not welcome, such a drastic measure might discourage some from seeking help, which means that they'll do anything in their power to avoid being detected. In other words, such a policy (of not hiring someone who's received help in the past) might backfire because people now have an added incentive to lie about their condition. So C is a good option (not a perfect one).
Now D is one of my favorite options because it presents a different cause for something. It's the jobs themselves that are making people more likely to have drinking problems. So the idea you could derive from this option is that no matter what you do, you won't be able to eliminate the risk of accidents completely, since the job in itself is stressful and causes people to drink. However, you'd be missing a very subtle note here: the phrase that makes this option less convincing is "exacerbate problems that they may have". If you don't have drinking problems to begin with, then you won't necessarily develop them later. If you already do, then it get even worse and the potential for issues later on greatly increases. D actually supports the passage.
If this were a real life exam, I would have picked D with the blink of an eye. I would have been wrong though...