In this task, you need to provide the correct option for a given problem from the provided options.

Example Input: Problem: a garrison of 400 men had a provision for 31 days . after 26 days 275 persons re - enforcement leave the garrison . find the number of days for which the remaining ration will be sufficient ?
Options: a ) 16 days , b ) 45 days , c ) 10 days , d ) 17 days , e ) 18 days
Example Output: a

Example Input: Problem: the probability of two events a and b are 0.25 and 0.40 respectively . the probability that both a and b occur is 0.20 . the probability that neither a nor b occur is _________
Options: a ) 0.45 , b ) 0.4 , c ) 0.55 , d ) 0.05 , e ) 0.6
Example Output: c

Example Input: Problem: a certain fruit stand sold apples for $ 0.80 each and bananas for $ 0.50 each . if a customer purchased both apples and bananas from the stand for a total of $ 7.20 , what total number of apples and bananas did the customer purchase ?
Options: a ) 10 , b ) 11 , c ) 12 , d ) 13 , e ) 14
Example Output:
c