The correct option is A Quadratic Binomial
A polynomial expression which contains only one term, two terms and three terms are called monomial, binomial and trinomial respectively.
A polynomial whose degree is equal to 1, 2 and 3 is called a linear, a quadratic and a cubic polynomial respectively.
For the given polynomial,
(x2+9),
the degree is 2 and it has 2 terms.
Hence, it is a quadratic binomial.