The correct representation for the number 80 in Roman numerals is "LXXX."
In Roman numerals, "L" represents 50, and "XXX" represents 30. When we combine them, we get 50 + 30 = 80.
On the other hand, "XXC" is not a valid representation of any number in Roman numerals. "C" represents 100, and it cannot be subtracted or placed before "X" to represent a number.