Which of the following is true about a yellow-level emergency?

A yellow-level emergency is a situation that signals a potential issue with an aircraft but is not yet critical enough to necessitate drastic measures such as evacuation. The correct answer indicates that a yellow-level emergency usually requires diversion and/or priority landing, which aligns with the nature of this classification.

In practice, when a yellow-level emergency is declared, it typically involves monitoring a situation that could become serious, such as technical issues or minor malfunctions. The aircraft may need to divert to another airport or receive priority landing clearance to ensure the safety of passengers and crew while managing the situation effectively.

In contrast, mandatory evacuation would represent a more severe classification, generally associated with red-level emergencies. Immediate return to the airport also suggests a higher urgency that does not apply to yellow-level emergencies, which allow for more flexible responses. Lastly, describing the situation as having "no significant issues" contradicts the definition of a yellow-level emergency, as it inherently implies that there is a concern that requires attention.