What announcement is made to passengers after a post-depressurization?

The correct choice is that the announcement made to passengers after a post-depressurization is, "You may now remove your masks." Following a depressurization event, oxygen masks are deployed to ensure passengers receive adequate oxygen until the cabin is safely stabilized or restored to normal pressure. Once the situation has been resolved and it is safe for passengers to remove the masks, flight attendants will communicate this clearly to ensure that everyone understands the situation has been stabilized and they can safely resume normal breathing without the masks.

Understanding when it is safe to remove the masks is a critical part of ensuring passenger safety and comfort in a stressful situation. Clear communication from the flight attendants helps to reassure passengers and create an environment where they can feel secure.