Air traffic controllers and nuclear power plant operators are not allowed to work exceptionally long hours, because to do so would jeopardize lives.
Conclusion (should)
Resident physicians should also be restricted from working exceptionally long hours (like 80 hour weeks).
Evidence (since)
Air traffic controllers and nuclear power plant operators are restricted from exceptionally long hours, because working exceptionally long hours would jeopardize lives.
Resident physicians, just like the air traffic controllers and nuclear plant operators, are engaged in work of a life-or-death nature.
Evaluate
Since this argument is based on a Comparison, we want to think about what similarities are being assumed or about what potential differences could be currently overlooked.
The author is Assuming a Similarity when it comes to the effect of long hours in residency training. We ban long hours for air traffic control and nuclear plants because to do so would jeopardize lives.
Did the author ever establish that long hours in resident training would also jeopardize lives? Not quite. They just said that physicians in residency are also engaged in work of a life-or-death nature.
The one big difference that might matter here is that physicians in residency are training, whereas air traffic controllers and nuclear plant operators presumably are not. Maybe we need to ban long hours for people who are "in charge" of doing the work, but we don't need to ban long hours for people who are just "in training"?
(I think in reality physicians in residency training are still making medical decisions, not just shadowing an established doctor is doing the real decision work, but LSAC wouldn't expect me to know that, so the "in training" vs. "not in training" might still be something they test).
Goal
Look for something establishing that or maybe making a linking assumption that . Or look for any answer that, if negated, would weaken the argument (i.e., would allow to argue that the restrictions on exceptionally long hours should not be applied to resident physicians).