The degree of a polynomial is determined by the highest power of the variable in the polynomial. In the case of the polynomial 12, we notice that there's no variable present in the expression.
However, we can think of 12 as a special case where it's expressed as 12*x^0 because anything raised to the power of zero is one. Therefore, the 12 can be considered as 12 times x to the power of zero.
So, judging on the basis of our polynomial degree definition, the highest power of the variable x present here is 0.
Therefore, the degree of the polynomial 12 is 0, which means the answer is a) Degree 0.