Definition: You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.
Input: Question: A bag contains 8 red and 4 white balls. One ball is drawn at random. What is the probability that the ball drawn is white?

 Option A: 4/7

 Option B: 2/3

 Option C: 5/8

 Option D: 1/4

 Option E: 5/7

Option B