You can upgrade 77-99 easily to Range B. Look at who you're in a multiway pot with. SB is a fish, CO is a 86/0 whaaaale. 86/0 players aren't thinking players (apart from i have a pair, i call!). Because we'll definitely get random 6x hands and even worse to call a pot or nearly pot-sized bet, maybe even bare gutshots and all sorts of junk, I think we can definitely bet hoping for a fish to come along and slow down/play pot control on bad turns and rivers imo. SB and CO are very passive so we're also not so scared of getting bluffed off of our hand too often, so of course fold to any aggression. I don't like the idea of checking to the raiser who might shy away from cbetting vs 3 opps and we give free shots for a random cocktail of overcards to outdraw us.