To determine the temperature scale based on the fact that water freezes at 32 degrees and boils at 212 degrees, let's examine the common temperature scales.
1. Celsius:
- Freezing point of water: 0°C
- Boiling point of water: 100°C
2. Fahrenheit:
- Freezing point of water: 32°F
- Boiling point of water: 212°F
3. Kelvin:
- Freezing point of water: 273.15 K
- Boiling point of water: 373.15 K
4. Rankine:
- Freezing point of water: 491.67°R
- Boiling point of water: 671.67°R
We can see that the freezing point of water at 32 degrees and boiling point at 212 degrees match the Fahrenheit temperature scale.
Therefore, the best answer from the provided choices is:
```
C. Fahrenheit
```
