Which of the following is an aircraft equipment requirement for a student pilot to fly solo in Class B airspace?

To fly solo in Class B airspace, a student pilot must have a Class B endorsement. This endorsement is crucial because it verifies that the student pilot has received specific training regarding the operations and requirements of flying in Class B airspace, which is more complex and heavily regulated compared to other types of airspace. The endorsement ensures that the pilot understands the necessary communication procedures and has the skills required to safely navigate within this type of airspace, including how to communicate with air traffic control effectively.

While having a government ID, a flight plan, or a radio communication device can be important in various aviation contexts, they are not specific requirements for a student pilot to conduct a solo flight in Class B airspace. Therefore, the Class B endorsement stands out as the essential requirement for ensuring safety and compliance in this regulated environment.