You have 16 save slots, use them..... I saved right before. Chose C. Played that one and saved in new slot after... Then immediately went back and played a and b to see how those played out.
Am now Replaying from about 2/3 of way through story due to my bugged game missing one of Solomon missions (meltdown was missing)- am now past that one.. Setting up the big heist now... I urge every one to save their game in a new slot every 10 percent or so.