In a polynomial, the exponents of the variables are always

⇒ according to definition Polynomial is defined as an expression consisting of variables and coefficients that involves non – negative exponents of variable.

Option (a) does not match to our solution.

Option (b) does not match to our solution.

Option (c) does match to our solution.

Option (d) does not match to our solution.

So, option (c) is correct answer.