There are 2 red, 5 yellow and 4 blue balls in a bag. If a ball is chosen at random from the bag, without looking, the probability of choosing a yellow ball is
Answer Choices
A. \frac{2}{11}
B. \frac{5}{11}
C. \frac{4}{11}
D. \frac{6}{11}
E. \frac{7}{11}