The correct option is D 17
The degree of a polynomial is always a whole number. (Whole numbers start from 0)
In the given options, only 6 and 0 are whole numbers. Hence, we can say that 6 and 0 can be the degree of a polynomial.
−5 and 17 are not whole numbers. Hence, they cannot be the degree of a polynomial.
Therefore, option (c.) and (d.) are the correct answers.