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: If j and k are integers whose product is 400, which of the following statements must be true?

Option A: n + k > 0

Option B: n is not equal to k.

Option C: Either n or k is a multiple of 10.

Option D: If n is even, then k is odd.

Option E: If j is odd, then k is even.

Ex Output:
Option E

Ex Input:
Question: Rs. 6000 is lent out in two parts. One part is lent at 5% p.a simple interest and the other is lent at 10% p.a simple interest. The total interest at the end of one year was Rs. 450. Find the ratio of the amounts lent at the lower rate and higher rate of interest?

Option A: 5:1

Option B: 5:5

Option C: 5:8

Option D: 5:4

Option E: 5:2

Ex Output:
Option B

Ex Input:
Question: David invested a certain sum of money in a bank that paid simple interest. The amount grew to $300 at the end of 2 years. He waited for another 3 years and got a final amount of $390. What was the principal amount that he invested at the beginning?

Option A: $340

Option B: $300

Option C: $280

Option D: $260

Option E: $240

Ex Output:
Option E