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: The probability that a visitor at the mall buys a pack of candy is 30%. If three visitors come to the mall today, what is the probability that exactly two will buy a pack of candy?

 Option A: 343

 Option B: 147

 Option C: 189

 Option D: 063

 Option E: 027

Ex Output:
Option C


Ex Input:
Question: A fish can go upstream at 35 kmph and downstream at 55 kmph, and then find the speed of the fish in still water?

 Option A: 45

 Option B: 55

 Option C: 35

 Option D: 65

 Option E: 70

Ex Output:
Option A


Ex Input:
Question: How many 7-letter words can be formed using the letters of the English alphabet that contain 3 different vowels and 4 different consonants?

 Option A: 5!*5c2 *21c2

 Option B: 4!*5c2 *21c2

 Option C: 4!*5c3 *21c2

 Option D: 6!*5c3 *21c2

 Option E: 7!*5c3 *21c4

Ex Output:

Option E