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.

Ex Input:
Question: A sum of Rs.96000 is divided into three parts such that the simple interests accrued on them for Eight, two and four years respectively may be equal. Find the amount deposited for 8 years.

 Option A: 14000

 Option B: 16000

 Option C: 12000

 Option D: 20000

 Option E: 13000

Ex Output:
Option C


Ex Input:
Question: How much time will it take for an amount of Rs. 900 to yield Rs. 81 as interest at 4.5% per annum of simple interest?

 Option A: 2 years

 Option B: 3 years

 Option C: 1 year

 Option D: 4 years

 Option E: 5 years

Ex Output:
Option A


Ex Input:
Question: In how many ways can 10 books be arranged on a shelf such that a particular pair of books should always be together?

 Option A: 9!

 Option B: 2!

 Option C: 3! * 2!

 Option D: 9! * 2!

 Option E: 9! * 5!

Ex Output:

Option D