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: a shopkeeper sold 30 articles at the cost price of 35 articles. then find the profit % or lost %
Options: a. 12 %, b. 15 %, c. 16.67 %, d. 18 %, e. 22 %
[EX A]: c

[EX Q]: Problem: if ( 2 ^ 16 ) ( 25 ^ s ) = 5 ( 10 ^ m ) what is the value of m ?
Options: a. 7, b. 8, c. 15, d. 16, e. 23
[EX A]: d

[EX Q]: Problem: a circular ground whose diameter is 35 metres, has a 1.4 metre - broad garden around it. what is the area of the garden in square metres ?
Options: a. 160.16, b. 6.16, c. 122.66, d. data inadequate, e. none of these
[EX A]:
a