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: In the arithmetic sequence t1, t2, t3, ..., tn, t1=23 and tn= tn-1 - 3 for each n > 1. What is the value of n when tn = 8?

 Option A: -1

 Option B: 6

 Option C: 10

 Option D: 14

 Option E: 20
Example Output: Option B

Example Input: Question: If x < y < 0, which of the following must be true?

 Option A: 2xy/3x is a negative integer

 Option B: x-y is a positive integer

 Option C: (-x

 Option D: x/y is a negative integer

 Option E: 2x+y is a negative integer
Example Output: Option C

Example Input: Question: If a: b = 12: 6, b: c = 9: 7, find a: b: c?

 Option A: 118: 53: 66

 Option B: 138: 73: 46

 Option C: 128: 43: 36

 Option D: 108: 63: 56

 Option E: 148: 83: 76
Example Output:
Option D