Furs were the best choice available to keep warm in cold weather. But furs have a drawback: They trap sweat. “If you're wearing furs in extremely cold temperatures and you're doing a lot of activity, you're going to sweat,” MacPhee says. “As soon as you stop that activity, you’re going to turn into an ice cube.” What is the meaning of the phrase “turn into an ice cube” as it is used in this paragraph?

It exaggerates the cold temperatures present in Antarctica.

It reinforces that a fur coat will keep a wearer warm in extreme conditions.

It emphasizes the danger of exploring Antarctica even with careful preparation.

It clarifies the reasons why so few explorers survived such a dangerous journey.