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

Input: Consider 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

Output: a


Input: Consider Input: Problem: log 3 n + log 15 n what is 3 digit number n that will be whole number 
Options: a ) 3375 , b ) 7292 , c ) 8291 , d ) 3929 , e ) 2727

Output: a


Input: Consider Input: Problem: there are 12 slate rocks , 17 pumice rocks , and 8 granite rocks randomly distributed in a certain field . if 2 rocks are chosen at random and without replacement , what is the probability that both rocks will be slate rocks ? 
Options: a ) 5 / 36 , b ) 7 / 64 , c ) 9 / 83 , d ) 11 / 111 , e ) 13 / 135


Output: d