Which statement best describes a plane captain's responsibility?

The responsibility of a plane captain includes ensuring the safety of all ground personnel. This is a critical aspect of the job since the plane captain is in a position of leadership and must take charge of operations on the flight line. A focus on safety is essential, as the environment is often busy and involves high-value aircraft and personnel working in close proximity.

This responsibility encompasses a variety of tasks, such as conducting briefings, overseeing ground operations, and ensuring that all safety protocols are followed. The plane captain must remain vigilant and proactive about recognizing potential hazards and mitigating risks to maintain a safe working environment for everyone involved.

While other roles may involve checking tools and equipment, supervising flight operations, or managing fueling, the overarching priority of the plane captain remains the safety of all personnel engaged in aircraft operations. Thus, the correct choice reflects the primary duty that encapsulates the essence of a plane captain's role.