Task: Question Answering
Input (English): Question: There are 21 balls in a box: 8 balls are green, 8 are blue and 5 are white. Then 1 green and 1 blue balls are taken from the box and put away. What is the probability that a blue ball is selected at random from the box?

 Option A: 1/13

 Option B: 4/13

 Option C: 3/13

 Option D: 5/19

 Option E: 6/13
Output (English): Option D