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 length of a room is 7 m and width is 4.75 m. What is the cost of paying the floor by slabs at the rate of Rs. 900 per sq. metre.

Option A: 25650

Option B: 25750

Option C: 26550

Option D: 26750

Option E: 29925

Ex Output:
Option E

Ex Input:
Question: 3 + 3 + 3 + 2 3^2 + 2 3^3 + 2 3^4 + 2 3^5 + 2 3^6 + 2 3^7 =

Option A: 3^7

Option B: 3^8

Option C: 3^14

Option D: 3^28

Option E: 3^30

Ex Output:
Option B

Ex Input:
Question: Line k is in the rectangular coordinate system. If the b-intercept of k is -2, and the y-intercept is 3, which of the following is an equation of line k?

Option A: -3b + 2y = 6

Option B: 3b + 2y = -6

Option C: 3b - 2y = 6

Option D: 2b - 3y = 6

Option E: -2b - 3y = 6

Ex Output:
Option A