In a vehicle with a manual transmission, when descending a steep hill, a good safe-driving practice is to _____.

A gear down and allow the engine to assist in braking.

explanation

In a vehicle with a manual transmission, try shifting into a lower gear going down long, steep hills. This will help control your speed and you won't have to break as sharply. Downshift before starting downhill since it may not be possible once you are going downhill.