Final answer:
The question seems to be about air traffic control and the separation between heavy aircraft, likely requiring a 5-mile separation to ensure safety from wake turbulence.
Step-by-step explanation:
The question seems to pertain to air traffic control and the required separation between heavy/jumbo category (H/C) aircraft. In air traffic control, there are specific separation minima that must be maintained between aircraft to ensure safety. These minima can depend on various factors, including the size of the aircraft and the wake turbulence they generate. Heavy aircraft such as H/C-5 and H/C-17 can create significant wake turbulence, and thus adequate separation must be maintained to prevent accidents. The specific separation required can vary depending on the governing body's regulations (e.g., FAA, EASA, etc.). Without specific regulatory context, it's difficult to provide an exact answer. However, standard practice for similar sized heavy jets suggests a minimum of 5 miles separation. Therefore, the likely answer to the question is "Separate a H/C-5 operating directly behind H/C-17 by B) 5 miles."