The maximum knots that a pilot in command (PIC) can exceed at or below 2,500 feet AGL within how many nautical miles (NM) of the primary airport in class C or D airspace is?

The question focuses on airspeed limits for a pilot in command (PIC) operating in proximity to class C or D airspace. In the United States, under FAA regulations, the maximum allowable indicated airspeed at or below 2,500 feet AGL within 4 nautical miles of the primary airport in class C or D airspace is set at 200 knots. This regulation is enforceable to promote safety and to reduce the potential for wake turbulence and other hazards that can arise from high-speed operations near an airport where aircraft are usually in a landing or departure configuration.

The choice of 200 knots is consistent with the rules established by the FAA and highlights the importance of maintaining reasonable speeds to ensure safe operations in busy airspace environments. The other options do not pertain to the established regulations regarding airspeed limits in this specific context, which is why they do not represent the correct answer.