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: what is the units digit of 32 ! + 50 ! + 4 ! + 4 ! ?
Options: a. 0, b. 2, c. 4, d. 6, e. 8
[A]: e


[Q]: Problem: a 16 % stock yielding 10 % is quoted at :
Options: a. 83.33, b. 110, c. 112, d. 120, e. 160
[A]: e


[Q]: Problem: a man can row downstream at 35 kmph and upstream at 25 kmph. find the speed of the man in still water and the speed of stream respectively ?
Options: a. 35, 3, b. 25, 5, c. 35, 4, d. 5, 30, e. 30, 5
[A]:
e