Final answer:
Shift into four-wheel-drive or all-wheel-drive when conditions require improved traction, such as in rain, snow, or off-road situations, and maintain that setting until conditions improve. Continuous switching is not necessary and can lead to excessive wear. Always refer to the vehicle's owner manual for specific guidelines.
Step-by-step explanation:
When it comes to engaging four-wheel-drive (4WD) or all-wheel-drive (AWD), you should opt for D) Engage the mode most suitable for the current driving conditions and maintain that setting. This mode is meant to provide better traction in slippery or off-road conditions. For 4WD, this often requires the driver to engage or disengage this feature manually, depending on their vehicle's system. AWD systems, on the other hand, typically manage power distribution automatically. However, for both systems, it's important to use them as intended to prevent drivetrain damage and to ensure optimal safety and vehicle performance.
It is not always necessary to continuously switch between modes, but rather engage 4WD or AWD when conditions are or are expected to be poor (such as rain, snow, mud) and disengage it when on clear, dry pavement to conserve fuel and reduce wear on the vehicle's drivetrain. Always consult your vehicle's owner manual for specific instructions on how best to use the 4WD or AWD systems, as they can vary between different makes and models.