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: The banker's discount on Rs. 1600 at 10% per annum is the same as true discount on Rs. 1680 for the same time and at the same rate. The time is :

Option A: 2 months

Option B: 4 months

Option C: 6 months

Option D: 7 months

Option E: None
Example Output: Option C

Example Input: Question: A certain company reported that the revenue on sales increased 40 % from 2000 to 2003, and increased 90 % from 2000 to 2005. What was the approximate percent increase in revenue for this store from 2003 to 2005?

Option A: 50 %

Option B: 36 %

Option C: 30 %

Option D: 32 %

Option E: 29 %
Example Output: Option B

Example Input: Question: A 270 meter long train running at the speed of 120 kmph crosses another train running in the opposite direction at the speed of 80 kmph in 9 seconds.What is the lenght of other train.

Option A: 210m

Option B: 220m

Option C: 230m

Option D: 240m

Option E: 250m
Example Output:
Option C