How often should a motorcyclist check the mirrors while driving?

Answer: D — Every 5-7 seconds.

A motorcyclist should check the mirrors every 5-7 seconds as this frequency allows for the most effective awareness of the surroundings. This regular interval of checking mirrors helps the rider to monitor traffic, anticipate changes in the environment, and keep track of vehicles approaching from behind. Such vigilance is crucial for safety, as it enables quick reactions to any potential hazards or sudden changes in road conditions. Checking mirrors at this interval strikes a balance between staying informed about the traffic situation and maintaining focus on the road ahead.