An envelope contains 2 sunflower seeds, 3 green bean seeds, and 4 pumpkin seeds. Carrie randomly chooses one of the seeds from the envelope. What is the probability that Carrie chooses a sunflower seed?
Answer Choices
A. \frac{2}{9}
B. \frac{5}{9}
C. \frac{9}{7}
D. \frac{7}{9}
E. \frac{1}{9}