re: P trap help - how would you repair?

I still stand by my post, the 90 needs to be replaced. I disagree with keaker in that I dont think there is enough pipe "B" to save and connect. Itd be fitting to fitting which I hate. Removing pipe "B" with a socket saver is simple.

Also, yes 1 1/2" even is only needed, but the original layout is 2" and its easy enough to match and replace with 2".

This is literally your exact scenario using the more expensive (Reed) socket saver, but its same principle with cheaper one:
Youtube Video LINK