What does category A, B, C, or D mean?
The simple answer is the car has been crashed.
Well this isn't exactly true, what it actually means is the car has had an insurance claim made against it so it may not exactly have been in a crash and a car may still have been in a crash without an insurance claim,this would result in no category being recorded.
The different categories indicate the level of damage to the car as follows.
Category A:
Beyond repair vehicle must be crushed.
Category B:
Vehicle's body must be crushed, may be used for supplying some replacement parts.
Category C:
Vehicle has been extensively damaged and repaired.
Category D:
Vehicle has been damaged, insurer decided not to repair.