The inside flat mirror should provide visibility of what?

The inside flat mirror is specifically designed to provide the driver with a view of all the students on the bus. This allows the driver to monitor the safety of the passengers while ensuring that they are seated and behaving appropriately during transit.

Visibility of the students is crucial for maintaining a safe environment on the bus, as it enables the driver to respond to any potential issues, such as a student standing or engaging in unsafe behavior. While the other options focus on external visibility or other components of the bus, the primary purpose of the inside flat mirror is to enhance the driver's awareness of the interior environment and the safety of the students on board.