Final answer:
The speed limit below 2,500 AGL and within 4 NM of the primary airport in Class C or D airspace is 200 knots for propeller-driven aircraft and 250 knots for jet aircraft.
Step-by-step explanation:
The speed limit below 2,500 AGL (above ground level) and within 4 NM (nautical miles) of the primary airport in Class C or D airspace depends on the aircraft type. For propeller-driven aircraft, the speed limit is 200 knots. For jet aircraft, the speed limit is 250 knots.