No person may operate an aircraft under IFR below 2000' within what horizontal distance of the course flown?

The correct answer is based on the regulations regarding IFR operations, specifically related to minimum altitudes and horizontal distance from the course being flown. According to FAA regulations, no person may operate an aircraft under Instrument Flight Rules (IFR) at an altitude below 2000 feet above the surface within a horizontal distance of 4 nautical miles from the edge of the obstacles in the area of operation.

This regulation is put in place to ensure a safe buffer zone around the aircraft, providing adequate vertical and horizontal separation from terrain and obstacles, thus minimizing the risk of collision or difficult emergency situations. The requirement ensures that pilots maintain a safe distance while flying at lower altitudes under IFR conditions, which can often be challenging due to visibility and weather conditions.

Understanding this regulation helps pilots maintain compliance during their flight operations and enhances overall safety in IFR flying.