What function does the clutch pedal serve in a vehicle with a manual transmission?

• It connects and disconnects the engine and transmission.
  Explanation:

  "The clutch pedal connects and disconnects the engine from the transmission, allowing you to change gears smoothly and control power delivery to the wheels."
• It overdrives the vehicle’s engine.
• It stops the vehicle immediately.
• It smoothly accelerates the vehicle from a stop.