Final answer:
FORGE is the correct answer, a challenging Field Training Exercise lasting over 81 hours and covering at least 40 miles, mostly at night.
Step-by-step explanation:
The correct answer to the question is A) FORGE. FORGE is a grueling and continuous Field Training Exercise (FTX) designed for ROTC cadets, and it's a part of the U.S. Army Cadet Command's Advanced Camp.
It tests the leadership and tactical skills of the cadets, where they are required to traverse challenging terrains, execute missions, and operate with minimal sleep.
The exercise is indeed over 81 hours and covers a minimum of 40 miles, predominantly during nighttime conditions, to test cadet endurance and night navigation capabilities.