Let's see if we can break this down. The famous quote by Jack Kerouac: "The only people for me are the mad ones," gives us a few things to work with.
First, the elephant in the room is surely the "only." If you remember from the Sufficient and Necessary lesson, only is an indicator that can hint at a necessary term. Now, what is "only" modifying? Well, we really only have two variables to choose from: people for me, and mad ones. If you picked mad ones, you would be correct. This might come as a surprise, since only comes right before "people for me."
However, if we look at what the quote is actually getting at, Kerouac isn't saying "If you're mad, then it's necessary that you're the person for me." That would mean Kerouac thinks every single mad person who's ever existed is 'for them.' Jack the Ripper? Yep. Emperor Nero? You bet. Obviously this isn't what he means!
Instead, what Kerouac is trying to say is "If you're a person for me, then it's necessary that you be mad." This means he only picks from the mad ones—ONLY the mad ones can make his cut. Not that every single mad person makes his cut.
This would land us squarely on PFM —> M.
This was a tougher question, as the placement of only can throw you off. A really great way to double check your work is to do as I did above, and reword the sentence in terms of If_____, then____. This format can really help you through questions like this.
