Which definition for the word hypothermia can be determined using context clues from this passage?

Prolonged exposure to cold can cause a serious health condition known hypothermia. Other dangers also exist in an wilderness environment including attacks by wild animals, falling tree limbs, and the minor cuts, scrapes and abrasions that can happen to just about anyone!

a dangerous fall that causes injury

a very low body temperature

severe mental confusion or disorientation

short-term memory loss