Mateo: Global warming has caused permafrost to melt under several arctic villages, forcing all their inhabitants to relocate at great expense.
Evidence (since)
Global warming has caused permafrost to melt under several arctic villages, forcing all their inhabitants to relocate at great expense.
Pollution from automobiles is a major contributor to global warming.
Conclusion (should)
The automotive industry should be required to help pay for the villagers' relocation.
Evaluate
The argument gives us evidence about automobiles contributing to a problem, then jumps to a conclusion claiming that the automobile industry should be required to help pay for that problem. This is an incredibly common pattern in Principle Strengthen questions. Regardless of whether or not that recommendation sounds reasonable, logically there is an important missing link in the argument.
For the argument to be valid, we need a premise to actually state that, if pollution from automobiles is a major cause of the village inhabitants needing to relocate, then the automotive industry should be required to help pay for the relocation.
autos are a cause → auto industry should pay
Goal
We're looking for an answer to make this missing connection. Since the correct answer only needs to strengthen the argument, it doesn't have to be a precise match for the assumption that we identified, but frequently it will be, so this a great question type to hone your prediction skills. Beware of answers that address a slightly different recommendation, make a recommendation for a different party, or reverse the logic. Eliminate any answer that has "auto industry should pay" as the sufficient condition.