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: A seller of used cars has 18 cars to sell and each of his clients selected 3 cars that he liked most. If each car was selected exactly thrice, how many clients visited the garage?

 Option A: 8

 Option B: 10

 Option C: 12

 Option D: 18

 Option E: 16
Example Output: Option D

Example Input: Question: If the 15th day of a month is three days earlier than Saturday, What day will it be on the 24th day of the month?

 Option A: Saturday

 Option B: Monday

 Option C: Sunday

 Option D: Wednesday

 Option E: Friday
Example Output: Option E

Example Input: Question: Suppose you have three identical prisms with congruent equilateral triangles as the end-polygons. Suppose you attach them by the rectangular faces so they are perfectly aligned. There will be some large faces created by two or more co-planar faces of the individual prisms: count each such large face as one. Given that, how many faces does the resultant solid have

 Option A:  4

 Option B:  9

 Option C: 6

 Option D:  10

 Option E:  12
Example Output:
Option C