Journalist: Contrary to popular opinion, it is more dangerous for an individual to drive during the day than during the night.
Evidence
A recent study found that in each of the last ten years, the number of traffic accidents that resulted in death was greater during the day than during the night.
Conclusion
It is more dangerous for an individual to drive during the day than during the night.
Evaluate
The evidence contains a comparison between the number of fatal traffic accidents that occur during the day and the number that occur at night. The evidence states that more fatal accidents occur during the day, but it's important to notice that this is only a correlation. Nothing in the evidence indicates what is causing more fatal accidents to occur during the day.
The evidence claims that it is more dangerous for "an individual"—meaning anyone—to drive during the day. To reach that conclusion, we need make an assumption about whatever factors are causing more fatal accidents to occur during daytime. We need to assume that those factors will affect everyone who drives during the day. But we haven't been told what is actually causing more fatal accidents to occur during daytime, so we can't be sure that those factors will affect all individuals who drive during the day.
Goal
An answer choice that strengthens the argument might describe a situation which makes driving more dangerous for everyone, but only occurs during the day, not at night.
Since this is an EXCEPT question, we will expect four of the answers to strengthen the argument. The one correct answer will not strengthen the argument. It will either weaken the argument or—more likely—not have any clear impact on the argument.