Can you choose your seats online?

Only for IMAX and Dolby Cinema. Not the rest.

Yes

Yes, for the recliner seats

Yed, for the newer seating that reclines

I'm certain you can reserve seats using the AMC app since I do it all the time.

Yes you can choose your seats online or in the theater when you're buying your tickets.

I think so too

Yes you can

Not certain but I think so