How should you adjust your speed on hills and curves?

Answer: B — Adjust speed to stop if necessary

Driving at posted speed limits should not always be done. This can be dangerous on hills and curves as speed limits are set for ideal conditions and drivers should adjust their speed based on the terrain. Maintaining a constant speed is also not recommended on hills and curves as the driver may lose control of the vehicle. Increasing speed on hills can put strain on the vehicle's engine and brakes, and can also be dangerous when approaching a curve. Therefore, the best option is to adjust speed to stop if necessary, as this allows the driver to safely navigate hills and curves without compromising control of the vehicle.