Before going down a steep grade, at what point should the driver gear down?

Answer: C — Before starting down the hill

Before starting down the hill is the best point to gear down as it allows the driver to have more control over the vehicle and maintain a safe speed while descending. Gearing down halfway down the hill may be too late and result in the vehicle picking up too much speed, while waiting until the bottom of the hill could cause the driver to lose control of the vehicle. It is always important to gear down before starting down a steep grade to ensure safe and controlled driving. Choosing the option that there is no need to gear down is incorrect as it is always best to be proactive and prepared when approaching a steep grade.