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

Input: Consider Input: Problem: the cost of 3 pens and 5 pencils is rs . 260 . also the cost of one pen and one pencil is in the ratio of 5 : 1 respectively . what is the cost of one dozen pens ? 
Options: a ) rs . 200 , b ) rs . 250 , c ) rs . 300 , d ) rs . 780 , e ) none of these

Output: d


Input: Consider Input: Problem: how many of the positive factors of 36 , 84 and how many common factors are there in numbers ? 
Options: a ) 2 , b ) 4 , c ) 3 , d ) 5 , e ) 6

Output: e


Input: Consider Input: Problem: how many zeros does 50 ! end with ? 
Options: a ) 20 , b ) 24 , c ) 25 , d ) 12 , e ) 32


Output: d