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: it is only in the second option we find the sentence a in continuation with the opening sentence d. sentence a alone explains, why the fear has such enormous effect on the human beings.
Options: a. 28, b. 99, c. 728, d. 27, e. 271
[A]: b


[Q]: Problem: a fort had provision of food for 150 men for 45 days. after 10 days, 25 men left the fort. find out the number of days for which the remaining food will last.
Options: a. 44, b. 42, c. 40, d. 38, e. 36
[A]: b


[Q]: Problem: the speed of a car is 60 km in the first hour and 30 km in the second hour. what is the average speed of the car ?
Options: a. 45 kmph, b. 65 kmph, c. 75 kmph, d. 85 kmph, e. 90 kmph
[A]:
a