A recent study has found that, surprisingly, the risk of serious

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A recent study has found that, surprisingly, the risk of serious injuries to workers is higher in industries that are monitored by government safety inspectors than in industries that are not so monitored.

Which one of the following, if true, most helps to explain the surprising finding described above?

(A) Government safety inspectors not only monitor but also train employees of the inspected firms to follow safe practices. - WRONG. Irrelevant.
(B) Government safety inspectors do not have the authority to enforce safety regulations. - WRONG. Possible but we have a better answer in C.
(C) Only those industries with an inherently high risk of on-the-job injury are monitored by government safety inspectors. - CORRECT. Sampling issue here. If two entities are not comparable than findings would be surprising.
(D) Workers behave especially cautiously when they believe their performance is being monitored by government safety inspectors. - WRONG. Get more complex from here. Not helpful.
(E) Some of the industries that are monitored by government safety inspectors have much lower rates of injuries than do other industries that are also so monitored - WRONG. Problem with 'some' and a comparison both of which do not help.

Answer C.
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I will give it a shot
So, the surprising finding is that even though few industries are monitored, risk of serious injuries is higher in Monitored industries than in Unmonitored(if that is a word:).
A - Is Irrelevant as this is not helping is anyway to resolve anything.
B - We are not focussing on enforcing but on monitoring. So, goes out of the window.
C - This explains that the ones that are monitored are already high in risk of Injuries so doesn't help much even if you monitor, those industries are inherently riskier.
D- Completely irrelevant. how they behave.
E- This is a slight weakner but we don't need this, we need explanation.

Let me know if there is anything that I missed!
Thanks in Advance!
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