Totally driver C's fault.
Driver A = blameless, just minding his own business
Driver B = overtaking driver C, on the inside, ready to outbrake. You DO NOT need to be alongside before the braking point to overtake - you need to have SIGNIFICANT overlap at turn-in. He did, but aside from that driver C attempted to overtake A from miles behind, despite the face someone was coming up the inside.
Driver C = Wasn't paying attention, and was hoping to try a really silly move up the inside of A. Probably someone like Phlos who can't race for sh**.
Driver A = blameless, just minding his own business
Driver B = overtaking driver C, on the inside, ready to outbrake. You DO NOT need to be alongside before the braking point to overtake - you need to have SIGNIFICANT overlap at turn-in. He did, but aside from that driver C attempted to overtake A from miles behind, despite the face someone was coming up the inside.
Driver C = Wasn't paying attention, and was hoping to try a really silly move up the inside of A. Probably someone like Phlos who can't race for sh**.