Why is stopping quickly in a curve more challenging compared to stopping in a straight line?

Answer: D — Some traction is needed for cornering

Stopping quickly in a curve is more challenging compared to stopping in a straight line because some traction is needed for cornering. When a motorcycle is in a curve, the tires are already utilizing some of the available traction for cornering purposes. Therefore, if you abruptly brake during a curve, you might exceed the available traction, which could lead to loss of control or a low side crash. It is essential to manage your speed and braking carefully in curves to maintain traction and control of the motorcycle.