Which fixes are required to be entered on a composite flight plan for an IFR route?

Answer: C — The fix where the IFR portion is to be terminated.

In the context of IFR flight planning, a composite flight plan is used when a portion of the flight operates under Visual Flight Rules (VFR) and another portion operates under Instrument Flight Rules (IFR). When filing such a plan, it is essential to designate certain fixes that signify the transition between VFR and IFR flight. The correct answer highlights the importance of identifying the fix where the IFR portion of the flight is to be terminated. This fix is crucial as it indicates to air traffic control where the aircraft will cease its IFR procedures, which can include adherence to specific routes, altitudes, and separation protocols. Specifying this fix ensures that both the flight crew and air traffic controllers are clear on when the aircraft will switch from IFR to VFR operations, thus maintaining safety and effective communication. In contrast, while compulsory reporting points and VORs may be relevant to navigation and communication, they are not specifically required to be included in the composite flight plan for the termination point of the IFR segment. Additionally, stating that no fixes are required does not align with the need for clarity and precision in flight operations under mixed rules. Therefore, identifying the termination fix is vital for proper coordination and adherence to air traffic control requirements.