What does a flashing amber light on the M-7 indicate?

Answer: C — Door Disabled

A flashing amber light on the M-7 indicates that the door is disabled. This signal serves as a critical alert to both the crew and passengers. When the amber light is flashing, it signifies that the door system is not operational, meaning the doors cannot be opened or closed. This is an important safety feature, as it informs everyone that the door is not functioning properly, which can help prevent accidents or injuries related to door usage. The other options refer to different states of the doors: a steady light would indicate that doors are either open or closed, and a non-flashing amber light would be a different operational status.