Task: Question Answering
Input (English): Question: There are r red marbles, b blue marbles and w white marbles in a bag. Write the ratio of the number of blue marbles to the total number of marbles in terms of r, b and w.

 Option A: r/ (r + b + w

 Option B: b/ (r + b + w

 Option C: w / (r + b + w

 Option D: r / (r + b 

 Option E: r / ( b + w
Output (English): Option A