Final answer:
The amount that rear wheels go 'off-track' depends on the distance between the front and rear wheels, known as the wheelbase. Weight, width, or the bus's length without considering the wheelbase are not the primary contributing factors to off-tracking.
Step-by-step explanation:
The amount your rear wheels will go 'off-track' refers to the phenomenon known as off-tracking or rear wheel cut. Off-tracking is when the path of the rear wheels of a vehicle is inside the path taken by the front wheels during a turn. This is a critical concept to consider in vehicle dynamics, especially for long vehicles like buses and trucks. This effect of off-tracking depends on the distance between the front and rear wheels, which is also known as the wheelbase of the vehicle. Therefore, the correct answer to the given question is c. The distance between front and rear wheels. The longer the wheelbase, the greater the off-tracking effect, as the rear wheels have a larger radius to cover during a turn compared to the front wheels. This does not directly depend on the weight or the width of the bus, nor purely on the length of the bus without considering the wheelbase.