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: the arithmetic mean and standard deviation of a certain normal distribution are 14.5 and 1.7, respectively. what value is exactly 2 standard deviations less than the mean ?
Options: a. 10.5, b. 11, c. 11.1, d. 12, e. 12.5
[A]: c


[Q]: Problem: find the smallest number that should be multiplied with 54000 to make it a perfect cube.
Options: ['a. 4', 'b. 5', 'c. 6', 'd. 3', 'e. 7']
[A]: a


[Q]: Problem: a bowl was filled with 10 ounces of water, and 0.004 ounce of the water evaporated each day during a 50 - day period. what percent of the original amount of water evaporated during this period ?
Options: a. 0.004 %, b. 0.04 %, c. 0.40 %, d. 2 %, e. 40 %
[A]:
d