Convert 100 degrees Fahrenheit to Celsius.

• A. 36.0 C
• B. 37.8 C
• C. 38.5 C
• D. 40.0 C

Answer: (B)

To convert Fahrenheit to Celsius, use C = (F − 32) × 5/9. For 100°F: subtract 32 to get 68, then multiply by 5 to get 340, and divide by 9 to get about 37.777...°C. Rounding to one decimal place gives 37.8°C. So 37.8°C is the correct result. The other options are off because they correspond to temperatures in Fahrenheit that would convert to notably different Celsius values (for example, 36.0°C is about 96.8°F, 38.5°C is about 101.3°F, and 40.0°C is about 104°F).