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: Consider Input: Question: The time taken by a man to row his boat upstream is twice the time taken by him to row the same distance downstream. If the speed of the boat in still water is 42 kmph, find the speed of the stream?

Option A: 12

Option B: 15

Option C: 14

Option D: 18

Option E: 19

Output: Option C

Input: Consider Input: Question: The simple interest on Rs.11000 at a certain rate of interest in five years is Rs.7200. Find the compound interest on the same amount for two years at the same rate of interest.

Option A: 3068.82

Option B: 3052.89

Option C: 3052.85

Option D: 3068.51

Option E: 3068.81

Output: Option D

Input: Consider Input: Question: A train crosses a platform of 150 m in 15 sec, same train crosses another platform of length 250 m in 20 sec. then find the length of the train?

Option A: 150

Option B: 788

Option C: 267

Option D: 266

Option E: 123
Output: Option A