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^2 − 20| = x, which of the following could be the value of x?

 Option A: -5

 Option B: -4

 Option C: 1

 Option D: 4

 Option E: 10
Example Output: Option D

Example Input: Question: The sum of the digits of a two-digit number is 15 and the difference between the digits is 3. What is the two-digit number?

 Option A: 69

 Option B: 78

 Option C: 96

 Option D: Cannot be determined

 Option E: None of these
Example Output: Option D

Example Input: Question: If the product of the integers r, s, t and u is 770, and if 1 < r< s< t< u, what is the value of r+ u?

 Option A: 10

 Option B: 13

 Option C: 16

 Option D: 18

 Option E: 21
Example Output:
Option B