How much should you increase the following distance on wet roads?

Answer: A — Double (4 seconds)

One should increase their following distance to double (4 seconds) on wet roads because wet roads can cause a decrease in traction and increase in stopping distance. A larger following distance allows for more reaction time, giving drivers enough time to come to a safe stop in case of an emergency. Increasing the following distance to triple (6 seconds) or 5 times may be excessive and not practical in most situations. It is also not recommended to continue with the regular following distance on wet roads as it may increase the risk of accidents. Lastly, not increasing the following distance at all would not be advisable as it may not allow enough time to safely stop in case of unexpected situations.