Will give brainliest to correct answer 30 points! what advantages did the vietcong have over u. s. troops in vietnam?

Um

During the Vietnam War, the Viet Cong acted as the military arm of the National Liberation Front (NLF), a communist-leaning political organization created to overthrow the democratic government of South Vietnam. Although the Viet Cong were outnumbered by and lacked the fire and air power of the South Vietnamese and their U.S. supporters, they had several tactical advantages. U.S. troops ultimately found themselves fighting a style of war they could not adapt to against an enemy they often could not find.

The answer is c because i know the answer is c