Vs nit playing 9/7/6 over 60 hands. Lol sample but appears super nitty.

Not a great river.
Was planning to bet/fold river and did so pretty quickly and am pretty confident I was beat.

However my sizing looks weak and leaves me open to being bluffed here with any ax etc.
I don't think someone this nitty is really capable of a bluff here and his range has a lot of boats on river.
I also think he never shoves worse for value.

My questions are.. A) is this a standard fold and should I ever consider a call here?
B) Should I bet a larger sizing with my range on river?
C) Could I check/call with this hand on river or do I lose too much vlaue from ax kx etc?

Thanks for any feedback guys :)