Which of the following hexadecimal values represents the letter 'C'?

The hexadecimal value that represents the letter 'C' is 0C. In the hexadecimal numbering system, the digits range from 0 to 9 and then continue from A to F, where A represents 10, B represents 11, C represents 12, D represents 13, E represents 14, and F represents 15 in decimal.

In this context, if we consider the decimal equivalent, the letter 'C' corresponds to the decimal number 12. Therefore, the correct choice is the one that aligns with this value, which is represented by the hexadecimal 0C. This is why the option indicating 12 reflects the correct answer for the code of 'C'.

The other options do not correspond to the letter 'C' in hexadecimal, as they would represent different characters or values in the ASCII table.