What is a sign that a driver may be under the influence of alcohol?

Answer: C — Frequent braking and sudden acceleration

Frequent braking and sudden acceleration can indicate that a driver may be under the influence of alcohol. Alcohol impairs a driver's judgment and reaction times, causing erratic driving behavior. A driver experiencing these symptoms might struggle to maintain a steady speed or control their vehicle, leading to unpredictable movements such as sudden stops and accelerations. This behavior can be a telltale sign that the driver is not fully in control of their faculties, as opposed to maintaining a steady course or obeying traffic laws, which are behaviors typically associated with sober driving. Such erratic actions are often observed in individuals who have consumed alcohol, making them a key indicator of impairment.