【单选题】

When you return the airplane to its usual condition, be sure to remove the pin from the release mechanism.

A、When you restore the airplane to its normal condition, make sure the pin is released from the release mechanism.
B、Ensure to remove the pin from the let-go mechanism after you return from the airplane to its common position.
C、When the airplane is in good condition, you must uninstall the pin of the release mechanism.