Which of the following formulas converts Fahrenheit to Celsius?

The formula that accurately converts Fahrenheit to Celsius is derived from the relationship between the two temperature scales. The correct conversion takes into account that the freezing point of water is 32 degrees Fahrenheit and 0 degrees Celsius, while the scales increment in different sizes.

Option B is the correct formula, as it adjusts for the offset of the freezing point by subtracting 32 from the Fahrenheit value and then multiplying by the factor 1.8 (which is the ratio of the size of degrees on the Fahrenheit scale to the Celsius scale). Specifically, when using this formula, you take the Fahrenheit value, subtract 32 to account for the difference in freezing points, and then multiply the result by 1.8 to convert the scale appropriately.

This method provides an accurate calculation of Celsius based on the properties of the temperature scales. Other options incorrectly represent the conversion process, either omitting necessary adjustments or applying incorrect operations that do not effectively translate temperatures from Fahrenheit to Celsius.