Final answer:
The possible roots of the polynomial function are -1 and -3.
Step-by-step explanation:
The Rational Root Theorem states that if a polynomial function with integer coefficients has a rational root p/q, where p is a factor of the constant term and q is a factor of the leading coefficient, then p/q is a possible root.
In this case, the constant term is -3, which means the possible factors are ±1 and ±3. The leading coefficient is 1, so the possible factors are ±1. Therefore, the possible rational roots are:
So, the correct answers are A and C.