Final answer:
A polynomial function with a negative leading coefficient.
Step-by-step explanation:
Quadratic functions are second-order polynomials. A quadratic function can be expressed in the form f(x) = ax^2 + bx + c, where a, b, and c are constants.
From the given options, the polynomial function can be described as having a negative leading coefficient (option A), which means that the coefficient 'a' is negative. This causes the graph of the function to open downwards.
Additionally, since the degree of a quadratic function is always 2, option B, which states that the function has an odd degree, is incorrect. Therefore, the correct answer is option A.