Using PEDs at unsafe levels does not create a big competitive advantage over using them
Why this is right
Whenever we're doing Necessary Assumption and we see an answer choice ruling out an idea with the word "not", we slow down and think, "ooh, let's negate this". Would this negation weaken? using PEDs at unsafe levels does create a big competitive advantage over using them at safe levels Yes, it hurts the author's notion that we should allow PEDs. The author is thinking "we'll allow them, doctors will administer them in safe doses, and the health risks will disappear". This negation is saying, "The athletes will want more than a safe dose from a doctor, if unsafe levels creates a big competitive advantage." After all, we were told that athletes will do whatever it takes to gain a big competitive advantage. So this negation suggests that athletes, even if we allow PEDs under doctor's supervision, will find a way to get unsafe levels in their system. I will say, this answer seems to bother me because it presents (when negated) an objection that feels out of scope. The author seemed to be saying, "Let's allow PEDs only under medical supervision" and this objection would only work if athletes were taking PEDs outside of medical supervision. But the idea of "allow" is in the context of sports. So the conclusion is meant to be saying, "We should allow baseball players to use PEDs, as long as it's under a doctor's care." And this answer, when negated, is making the objection that, "Athletes won't just be content to take the safe, allowed level of PEDs. They'll still go around the rule; they'll do whatever it takes to gain the big competitive advantage of an unsafe dose."
Skill tested: Necessary Assumption · how this choice captures the argument's function is the move to repeat next time.