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.

Input: Consider 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

Output: Option C


Input: Consider Input: Question: If each of 4 digit code is formed of integers from 1 to 50, inclusively, and each of the digits are different, how many possible codes are there?

 Option A: 5527200

 Option B: 5586300

 Option C: 5598600

 Option D: 5547800

 Option E: 2569800

Output: Option A


Input: Consider Input: Question: A man can row with a speed of 30 kmph in still water. If the stream flows at 10 kmph, then the speed in downstream is?

 Option A: 40

 Option B: 27

 Option C: 20

 Option D: 99

 Option E: 2


Output: Option A