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'.

Input: Consider Input: Problem: ( 18 ) 7 x ( 5832 ) - 2 ÷ ( 324 ) - 1 = ( 18 ) 7 
Options: a ) 5 , b ) 4 , c ) 3 , d ) 2 , e ) 1

Output: c


Input: Consider Input: Problem: ages of two persons differ by 20 years . if 6 year ago , the elder one be 3 times as old the younger one , find their present age 
Options: a ) 12,28 , b ) 14,30 , c ) 16,36 , d ) 18,34 , e ) 19,34

Output: c


Input: Consider Input: Problem: when x is multiplied by 3 , the result is 26 more than the result of subtracting x from 26 . what is the value of x ? 
Options: a ) - 4 , b ) - 2 , c ) 11 , d ) 13 , e ) 22


Output: d