What percentage of the potential power is supplied by the front brake?

Answer: C — 75%

The front brake supplies a significant portion of the motorcycle's stopping power, typically around 70-80%, depending on the specific motorcycle and braking system. This high percentage is due to the front brake's role in shifting the weight of the motorcycle forward during braking. When you apply the front brake, the weight of the bike and the rider is transferred to the front wheel, increasing the traction and effectiveness of the front brake. Selecting an answer of 75% aligns with this understanding, reflecting that the front brake is critical for effective stopping. In contrast, the rear brake contributes less to the overall stopping power; relying too heavily on it can lead to instability or even loss of control. This is why understanding the distribution of braking force is essential for safe motorcycle operation.