Freezing point of water is
32° F
The freezing point of pure water at 1 atmosphere pressure is 0°C.
Converting to Fahrenheit using $F = \frac{9}{5}C + 32$, substitute C = 0: $F = 0 + 32 = 32°$F.
The other options (40°, 42°, 34° F) correspond to temperatures above freezing.
Hence, 32° F.
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