Option (c) is the correct answer.
Explanation:
A monomial is defined as an algebraic expression in which there is only one term present.
For example, 3x is a monomial.
A binomial is defined as an expression where there will be two terms present. For example, is a binomial.
A polynomial is defined as an algebraic expression which contains more than two terms.
For example, is a polynomial.
Thus, we can conclude that the given expression is a polynomial.