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: If x and y are negative integers, which of the following statements must be true?
I. (-x)^y is positive.
II. (-x)^(-y) is positive.
III. x^(-y) is positive.

 Option A: None

 Option B: II only

 Option C: I and II

 Option D: I and III

 Option E: I, II and III
Example Output: Option C

Example Input: Question: The compound ratio of 1:3, 3:2 and 4:5?

 Option A: 1:9

 Option B: 1:7

 Option C: 1:2

 Option D: 2:5

 Option E: 1:4
Example Output: Option D

Example Input: Question: By selling 15 pencils for a rupee a man loses 60%. How many for a rupee should he sell in order to gain 60%?

 Option A: 2.15

 Option B: 4.2

 Option C: 5.18

 Option D: 3.75

 Option E: 4.2
Example Output:
Option D