I don't understand why B is so obviously correct. Aren't we making an assumption by choosing B that they didn't use a combination of antibiotics? All the stimulus says is that any SINGLE antibiotic (ON ITS OWN) isn't powerful enough to eliminate the bacteria.

B says, "If any antibiotic now on the market is used against bacterial species X, that species will develop greater resistance to it within a few years." But shouldn't it have said, "If any antibiotic now on the market is used ALONE against bacterial species X, that species will develop greater resistance to it within a few years?"

If two are used together to successfully eliminate the bacteria, wouldn't the exception still technically be applied? This alternative was even hinted at in the stimulus by including the word "single." That word wasn't necessary and really made me feel like they were introducing a trap.

could someone explain the "priority" category in the answer key? Some questions are marked as high question difficulty but low priority. Other questions are lower in question difficulty but high priority. wouldn't the high priority questions always be the hardest ones? also what does "V." stand for?

what does priority even mean? are they scored differently? or are we just supposed to pay attention to them because they're hard?

I feel like I missed a lesson on answer key notations because I also don't know what "Psg/Game/S Difficulty" means.