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On a double or triple vehicle, which wheels offtrack the most?

A The rear wheels of the last trailer
Explaination
Off-tracking is defined as the different paths taken by the front and rear wheels in a turn. The longer the vehicle, the greater the difference will be. Thus, the wheels on the front trailer will offtrack more than the tractor's rear wheels, and the wheels on the rearmost trailer will offtrack most of all.
B The rear wheels of the first trailer
C The rear wheels of the tractor