The immersion suit is designed to keep the body's core temperature within normal ranges. Which statement correctly reflects the maximum allowed drop after six hours in water between 32°F and 35.6°F?

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The main idea here is understanding how much core body temperature can safely drop during prolonged exposure to very cold water while wearing an immersion suit. The suit reduces heat loss, but water in the 32–35.6°F range still pulls heat away from the body over time. Safety standards set a maximum allowable drop in core temperature after six hours to prevent rapid progression into hypothermia and to keep rescuers’ options viable.

Starting from a typical normal core temperature (around 98.6°F), restricting the drop to 2–5°F means the core would be roughly 93.6–96.6°F after six hours. That range helps maintain sufficient physiological function to keep the person conscious, responsive, and more easily rescued, while reflecting the trade-off between insulation and the inevitable cold stress of extended immersion.

Ranges outside this window would either imply an unrealistically small cooling given six hours in such cold water, or would permit too much cooling, increasing the risk of hypothermia-related decline.