Using a lower gear helps reduce speed and brake wear when driving downgrade.

Answer: A — True

Using a lower gear does indeed help reduce speed and brake wear when driving downgrade in any type of vehicle, whether it is manual or automatic. This is because using a lower gear causes the engine to rev higher and provide more resistance, slowing down the vehicle without relying on the brakes. This not only reduces wear and tear on the brakes, but also helps maintain better control of the vehicle while going downhill. The other options are incorrect because regardless of the transmission type or road condition, using a lower gear can still be beneficial in reducing speed and brake wear when driving downgrade.