Joanne has a bag of marbles that contains 5 blue marbles, 4 red marbles, 2 white marbles, and 1 yellow marble. If Joanne wants to pick a marble out of the bag without looking, what is the probability that she will pick a red or yellow marble?

A. 1
   12

B. 4
   12

C. 5
   12

D. 7
   12