Which of the following is a proper technique for braking when driving downhill?

Using proper braking techniques when driving downhill is essential for maintaining vehicle control and ensuring safety. When descending a slope, gravity increases the vehicle's speed, and relying solely on the brakes can lead to overheating and reduced effectiveness, potentially causing brake failure. Proper techniques include downshifting to a lower gear, which helps utilize engine braking to slow the vehicle while reducing reliance on the brakes. This method allows for better control and prevents brake wear.

When considering the other options, shifting to neutral may seem like a way to save on fuel, but it removes control over the vehicle and can be dangerous. Continuously applying the brakes can lead to overheating, while braking only when necessary may not effectively manage speed on a steep incline. Therefore, employing proper braking techniques, which include using engine braking and intermittent brake application, is the safest approach when driving downhill.