Which of the following is the factorization of the quadratic expression x^2 - 5x + 6?

Answer: A. (x - 2)(x - 3)
The expression x^2 - 5x + 6 can be factored into (x - 2)(x - 3) because -2 and -3 are the roots of the equation x^2 - 5x + 6 = 0.