Who gives instructions to vehicle drivers around aircraft on the ground?

Answer: B — Aircraft crew members

Aircraft crew members are responsible for giving instructions to vehicle drivers around aircraft on the ground. This is critical for maintaining safety during ground operations, as the crew has a comprehensive understanding of the aircraft's positioning and operational needs. They are trained to communicate effectively with vehicle operators to ensure that aircraft are not endangered by moving vehicles and that all safety protocols are observed. In contrast, while the control tower manages air traffic flow and issues instructions related to takeoff and landing clearances, it does not typically oversee ground movements directly at the aircraft level. The ground maintenance team focuses on the upkeep of the aircraft and may direct movement in specific situations, but they are not primarily tasked with guiding vehicle traffic around the aircraft. Similarly, allowing any personnel nearby to direct vehicle movements would create confusion and compromise safety, as not everyone present may have the necessary training or awareness of the situation.