Here is my question of the day- (it is really a hard one)

C=5/9 (F−32)

The equation above shows how temperature F, measured in degrees Fahrenheit, relates to a temperature C, measured in degrees Celsius. Based on the equation, which of the following must be true?

I) A temperature increase of 1 degree Fahrenheit is equivalent to a temperature increase of 59 degree Celsius.

II) A temperature increase of 1 degree Celsius is equivalent to a temperature increase of 1.8 degrees Fahrenheit.

III) A temperature increase of 59 degree Fahrenheit is equivalent to a temperature increase of 1 degree Celsius.

A) I only

B) II only

C) III only

D) I and II only

brainliest will be given away for the correct answer

good luck!!