Given a math problem with context and a question and 5 answer choices, the task is to provide the correct answer choice based on the problem. You must choose one of the given answer choices by letter: a, b, c, d, or e; anything else is invalid.

[EX Q]: Problem: if the average of 5 positive integers is 50 and the difference between the largest and the smallest of these 5 numbers is 10, what is the maximum value possible for the largest of these 5 integers ?
Options: a. 50, b. 58, c. 49, d. 48, e. 44
[EX A]: b

[EX Q]: Problem: if y exceeds x by 25 %, then x is less than y by ?
Options: a. 28 %, b. 21 %, c. 20 %, d. 30 %, e. 29 %
[EX A]: c

[EX Q]: Problem: the area of a circular field is 17.56 hectares. find the cost of fencing it at the rate of rs. 4 per metre approximately
Options: a. 4457, b. 4567, c. 5943, d. 4547, e. 4675
[EX A]:
c