I’m looking at the main diagram in order to think about this question.
Where couldn’t we put two females? Well, the only obvious place is in R and T south. Then there would be no place to split up the three males in across three dormitories.
That’s why B is CORRECT.
That’s a much faster method than the alternative, which is to draw out each scenario and see what works.
A and C both have females in R south and one other place. That’s fine. There are no rules associated with females being in any of the places mentioned, and all setups leave room for three males in three separate dorms.
D and E both involve females being in Wisteria South and one other place. Again, there are no rules telling us what to do if females are in those places. Both setups leave space for three males to go in three separate dorms.
Want a free Logic Games lesson?
Get a free sample of the Logic Games Mastery Seminar. Learn tips for going faster at logic games