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.

[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
[A]: d


[Q]: Problem: an article is bought for rs. 675 and sold for rs. 900, find the gain percent ?
Options: a. 33 1 / 8 %, b. 33 9 / 3 %, c. 33 1 / 3 %, d. 93 1 / 3 %, e. 33 2 / 3 %
[A]: c


[Q]: Problem: sakshi can do a piece of work in 12 days. tanya is 20 % more efficient than sakshi. the number of days taken by tanya to do the same piece of work is ?
Options: a. 10, b. 12, c. 14, d. 16, e. 18
[A]:
a