When driving, always keep your eyes moving. this statement means to:

scan the road for potential hazards.

take a quick glance, then return your sight to the front.

take a quick look every 5-10 seconds (mirrors, speedometer, gas gauge).

all of the above are correct.

The right answer is D. All of the above are correct.

When driving, the driver can not keep his eyes on a single part of the road or the car. Looking for information by sight is known as visual perception and involves using Central vision and the peripheral vision.
- The central vision covers a very small range of vision but it is very sharp and allows us to make judgments of distance and comprehension while driving.
- The peripheral vision is not very sharp but it is more sensitive to light and movement, therefore it allows us to detect important situations on the road, like a car approaching the side.

I hope this information can help you.