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: The number of diagonals of a polygon of n sides is given by the formula z=n(n-3)/2. If a polygon has twice as many diagonals as sides, how many sides does it have?

Option A: 3

Option B: 5

Option C: 6

Option D: 7

Option E: 8

Output: Option B

Input: Consider Input: Question: Triangle STV has sides ST = TV = 26, and SV = 20. What is the area?

Option A: 160

Option B: 180

Option C: 200

Option D: 220

Option E: 240

Output: Option E

Input: Consider Input: Question: Sixty men can stitch 200 shirts in 30 days working 8 hours a day. In how many days can 45 men stitch 300 shirts working 6 hours a day?

Option A: 33

Option B: 77

Option C: 33

Option D: 80

Option E: 12
Output: Option D