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: A sum of $500 amounts to 600 in 2 years at simple interest. If the interest rate is increased by 10% it would amount to how much ?

 Option A: $500

 Option B: $700

 Option C: $800

 Option D: $600

 Option E: $300

Ex Output:
Option B


Ex Input:
Question: The average weight of 10 person's increases by 4 kg when a new person comes in place of one of them weighing 70kg. What is the weight of the new person?

 Option A: 85

 Option B: 86.5

 Option C: 90

 Option D: 88.5

 Option E: 110

Ex Output:
Option E


Ex Input:
Question: 39 persons can construct a road in 12 days, working 5 hours a day. In how many days will 30 persons, working 6 hours a day, complete the work?

 Option A: 10

 Option B: 13

 Option C: 14

 Option D: 15

 Option E: None of these

Ex Output:

Option B