In this task, you need to answer the given multiple-choice question on the general math. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Example Input: Problem: in a urban village of india named ` ` owlna ' ' , 70 % people have refrigerator , 75 % people have television , 65 % people got computers and 95 % got air - conditionor . how many people ( minimum ) got all these luxury . 
Options: a ) 5 % , b ) 7 % , c ) 3 % , d ) 9 % , e ) 15 %
Example Output: a

Example Input: Problem: if 12 : 8 : : x : 16 , then find the value of x 
Options: a ) 18 , b ) 24 , c ) 28 , d ) 16 , e ) 20
Example Output: b

Example Input: Problem: the average of 1 st 3 of 4 numbers is 16 and of the last 3 are 15 . if the sum of the first and the last number is 19 . what is the last numbers ? 
Options: a ) 2 , b ) 4 , c ) 6 , d ) 8 , e ) 7
Example Output:
d