What is the average driver's reaction time?

Answer: B — 1 to 1.5 seconds

On average, a driver's reaction time is 1 to 1.5 seconds. This means that from the moment they perceive a potential threat on the road, it will take them approximately 1 to 1.5 seconds to physically react by braking, swerving, etc. Option A is incorrect because 0.5 to 1 second is too short of a time for an average reaction. Option C and D are also incorrect because 2 to 2.5 seconds and 3 to 3.5 seconds are too long for an average reaction, indicating a slower response time. It is important for drivers to be aware of their reaction time in order to anticipate potential hazards on the road and react appropriately.