What is necessary for passing a movement/non-movement marking along with an escort?

Answer: B — Two-way communication with the ATCT

Passing a movement or non-movement marking while accompanied by an escort necessitates two-way communication with Air Traffic Control Tower (ATCT). This is crucial for ensuring mutual awareness and maintaining safety, as it allows the driver and ATCT to share vital information regarding movement plans and any potential changes in the airspace or surface conditions. Effective communication ensures that the escort can safely guide the driver across critical areas without interfering with aircraft operations or other ground vehicles. Other options may suggest various procedural protocols, such as the need for signaling or proximity to the escort, but they do not provide the foundational communication link that is essential for safe operations within the air traffic environment at O'Hare.