Melissa has a bag that contains 6 red marbles, 8 yellow marbles, and 18 blue marbles. If she chooses one marble from the bag, what is the probability that the marble is not blue?
A. [tex]\frac{9}{16}[/tex]
B. [tex]\frac{7}{9}[/tex]
C. [tex]\frac{2}{9}[/tex]
D. [tex]\frac{7}{16}[/tex]