When going down a steep hill, you should:

When driving down a steep hill, shifting to a lower gear is the recommended action because it allows for better control of the vehicle's speed. Lower gears utilize engine braking, which helps to slow down the vehicle without relying solely on the brakes. This is particularly important on steep descents where brakes can become hot and may lose effectiveness due to overheating. Engaging a lower gear enables the engine to help manage speed, thereby reducing the risk of brake failure and enhancing overall safety.

The other options do not promote safe driving practices in this scenario. Accelerating to gain speed can lead to losing control, while using cruise control could hinder your ability to react to changes in incline and terrain. Maintaining your current gear may not provide sufficient braking power, especially on a steep hill where it is crucial to slow down effectively.