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.

Example Input: Question: A machine puts c caps on bottles in m minutes. How many seconds will it take to put caps on b bottles?

Option A: 60bm/c

Option B: bm/60c

Option C: bc/60m

Option D: 60b/cm

Option E: b/60cm
Example Output: Option A

Example Input: Question: A man can do a piece of work in 5 days, but with the help of his son he can do it in 3 days. In what time can the son do it alone ?

Option A: 13/2

Option B: 19/2

Option C: 21/2

Option D: 15/2

Option E: None
Example Output: Option C

Example Input: Question: The price of 2 sarees and 4 shirts is Rs. 1600. With the same money one can buy 1 saree and 6 shirts. If one wants to buy 12 shirts, how much shall he have to pay ?

Option A: 4800

Option B: none of these

Option C: 3600

Option D: 1200

Option E: 2400
Example Output:
Option E