Which of these is the best reason explaining why you can have frost on the house

Question

Which of these is the best reason explaining why you can have frost on the houseplant on the porch even though the thermometer outside is reading 36° F A. The thermometer is mounted at 6 feet off the ground and in calm winds colder air can settle to the ground causing frost. B. You bought the thermometer at KMART, enough said C. Pure water freezes at 32°, but since there are solutes dissolved in the water in the air it raises the freezing point to 36° D. Plants are naturally colder due to the solid cell walls (cellulose) and that causes the frost to form much quicker on them.

Explanation / Answer

C. Pure water freezes at 32°, but since there are solutes dissolved in the water in the air it raises the freezing point to 36°

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