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 is twice as good a work man as B and together they finish the work in 14 days. In how many days A alone can finish the work?

 Option A: 21 days

 Option B: 51 days

 Option C: 35 days

 Option D: 31 days

 Option E: 24 days

Option A