Why should you use your right foot for both brake and gas pedals?

• So you won’t step on both pedals at the same time
  Explanation:

  "Use your right foot for both brake and gas pedals so you won't step on both pedals at the same time or activate your brake lights unnecessarily. Press the brake pedal firmly and evenly."
• So you can easily step on both pedals at the same time
• So you can easily shift gears
• None of these