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 father was as old as his son's present at the time of your birth. If the father's age is 44 years now, the son's age 5years back was?

Option A: 10 years

Option B: 12 years

Option C: 14 years

Option D: 16 years

Option E: 17 years
Example Output: Option E

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: Find the average (arithmetic mean) of x and y if the average of x, y, and 50 is 20 more than the average of x, y, 50, and 70.

Option A: 100

Option B: 120

Option C: 140

Option D: 180

Option E: 200
Example Output:
Option E