Choose the best reason for factoring out the greatest common factor, if there is one, before attempting to factor a trinomial. Choose the correct answer below. A. Factor out the greatest common factor first because it makes the trinomial easier to factor if the numerical and variable parts are simpler. B. Factor out the greatest common factor first because there is always a greatest common factor to remove. C. Factor out the greatest common factor first because it completes the factorization of the trinomial. D. Factor out the greatest common factor first because the constant term will be positive.