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 Q]: Question: If the ratio of a to b is 2 to 3 and the ratio of b to c is 1 to 5, what is the ratio of a to c?

Option A: 4/15

Option B: 1/3

Option C: 2/15

Option D: 4/5

Option E: 7/6
[EX A]: Option C

[EX Q]: Question: a, b, c and d are four consecutive numbers. If the sum of a and dis 113, what is the product of b and c?

Option A: 2652

Option B: 2578

Option C: 2534

Option D: 3192

Option E: 4234
[EX A]: Option D

[EX Q]: Question: The ratio of cost price to the market price of an article is 4: 5. What is the profit percentage if the ratio of the profit percentage on selling the article to the discount allowed on it is 5: 4?

Option A: 10%

Option B: 12%

Option C: 12.5%

Option D: 15%

Option E: 16%
[EX A]:
Option C