ANSWER
The correct answers is B and D.
EXPLANATION
According to the rational root theorem, all factors of 18 divided by all factors of 9 are possible rational roots.
[tex] \pm \frac{3}{9} = \pm \frac{1}{3} [/tex]
[tex] \pm \frac{3}{1} = \pm 3[/tex]
Therefore option B and D are the correct answers.
