How many crew members are needed for communication during an emergency?

In an emergency situation, effective communication is crucial for ensuring the safety and security of all crew members and passengers. Having two crew members inside and two outside allows for clear channels of communication and coordination.

Crew members inside the vehicle can monitor the situation, provide support to passengers, and relay information to those outside. Simultaneously, the two crew members outside can assess any external risks, communicate with emergency responders, and potentially guide the crew members inside regarding the external environment.

This arrangement minimizes the chances of miscommunication and allows for more organized approaches during emergencies, which is essential for effective crisis management. Having multiple crew members both inside and outside ensures that there is redundancy in communication and enhances situational awareness, promoting safety during emergencies. This makes option B the most suitable choice for communication needs in such scenarios.