What could be a reason for a school bus to pull to one side when braking?

Answer: B — Uneven brake wear or a malfunctioning brake system

The reason a school bus might pull to one side when braking is typically related to uneven brake wear or a malfunctioning brake system. When the brakes are not functioning evenly across all wheels, one side may apply more force than the other. This could occur due to various factors, such as worn brake pads, a stuck caliper, or issues with the brake lines. If one side's braking power is significantly different from the other, it can cause the vehicle to veer to one side during braking, impacting both safety and control. In contrast, while a curved road design might influence a vehicle's trajectory under normal driving conditions, it wouldn't specifically explain a consistent pulling to one side when brakes are applied. A heavy passenger load could affect handling but would not inherently cause a consistent pull during braking unless it contributed to uneven weight distribution, which is less common. Lastly, weather conditions such as wet or icy roads can affect traction but do not directly cause a vehicle to pull to one side when braking unless compounded with other underlying brake issues.