A third-degree polynomial $\mathrm{P}(\mathrm{x})$ with real coefficients and leading coefficient 3 is known to have exactly 2 different real roots.
If $\mathbf{P}(1) = \mathbf{P}(2) = \mathbf{0}$, then the value $\mathbf{P}(3)$ is
I. 6
II. 12
III. 18
Which of these numbers can it equal?
A) Only I
B) Only II
C) Only III
D) I and II
E) II and III