What information must be communicated during a handoff between controllers?

During a handoff between controllers, it is crucial to communicate essential flight information, which includes details such as the aircraft's current altitude and its intended route. This information is vital for ensuring that the aircraft maintains safe separation from other traffic and adheres to air traffic control instructions as it transitions between different sectors or areas of responsibility.

Providing accurate altitude and route information helps the receiving controller to establish situational awareness and maintain control over the aircraft. It allows for effective coordination with other traffic in the airspace and assists in planning for upcoming phases of flight, such as approach and landing or en-route navigation adjustments.

In contrast, communicating only the destination does not provide sufficient context for the receiving controller to manage the flight safely. Additionally, details like the number of passengers on board or the time of the last fuel check, while important for overall operations, are not critical for the immediate safe handling of the aircraft during the handoff process between controllers. Thus, option B encompasses the essential elements needed for a seamless transition in air traffic control operations.