[joker122]

Regarding A, B and C:
you gave him such a tight/weak range that getting to showdown is going to be correct no matter how the board comes, let alone a totally innocuous board like 8xx. even with really ugly turn and rivers like QJ he’s still going to be pair-less 25% of the time so you'd never fold getting 7.5:1. (though that would change depending on the info you had about how often he 2 and 3 barrells compared to how often he gives up, since, for instance a 3 barrel might always mean a pair or better). as for raising vs. calling, raising any turns cards other than an A or 7 doesn’t seem to make any sense. However, raising vs. calling on a 9-2 turn is actually much closer and I had trouble figuring what is best using stove.
Your “big question” is harder to figure out and I’ll get to it tomorrow.