it took me a while to get this one but the way i am doing it is only looking at the last sentence and then saying what supports just this last sentence - idk if that will always work tho

so basically the author is writing a stimulus

then it ill be questioned by the question stem and then answers

to play piano you must be able to read musical notes. Therefore all who can read musical notes play piano --not valid

so can many also mean all?

subset: student at harvard

superset: student

Being a student is necessary to being a student at Harvard

But it is not necessary to be a student at harvard to be a student

so basically to be cat you do not necessarily have to be fat. but in order to be a fat cat it is necessary to be a cat

premise is setting up for the conclusion to be supported