Autopilot disengagement will initiate an aural tone. The tone can be cancelled by a second actuation of the:

• A. Autopilot disengage switch
• B. All the answers are correct
• C. Trim Interrupt Switch
• D. AP Disconnect Button

Answer: (B)

When the autopilot disengages, the system issues an aural tone to alert you that you’re no longer under automatic flight control. That tone is designed to be cleared by resetting or acknowledging the autopilot system. A second action on any of these controls achieves that reset: actuating the autopilot disengage switch again, using the Trim Interrupt Switch, or pressing the AP Disconnect Button. Each of these inputs changes the autopilot’s state or acknowledgement of the disengagement, which clears the alert without requiring you to take additional flight actions. That’s why the correct choice is that all of these actions can cancel the tone.