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Which of the following is not a factor that can affect a driver's mental alertness?

  1. Listening to music

  2. Daydreaming

  3. Not drinking enough water

  4. Eating a healthy snack

The correct answer is: Listening to music

Listening to music can actually affect a driver's mental alertness, as it can be distracting and cause the driver to become less focused on the road. Daydreaming and not drinking enough water can also have a negative impact on a driver's mental alertness. Eating a healthy snack, however, can actually improve a driver's mental alertness by providing essential nutrients and energy.