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'.

Ex Input:
Problem: a club wants to mix 20 pounds of candy worth $ 8.00 per pound with candy worth $ 5.00 per pound to reduce the cost of the mixture to $ 6.00 per pound . how many pounds of the $ 5.00 per pound candy should be used ?
Options: a ) 20 , b ) 30 , c ) 40 , d ) 50 , e ) 60

Ex Output:
c

Ex Input:
Problem: for how many integer values of n will the value of the expression 4 n + 7 be an integer greater than 1 and less than 120 ?
Options: a ) 22 , b ) 24 , c ) 26 , d ) 28 , e ) 30

Ex Output:
e

Ex Input:
Problem: each digit 1 through 5 is used exactly once to create a 5 - digit integer . if the 5 and the 4 can not be adjacent digits in the integer , how many 5 - digit integers are possible ?
Options: a ) 48 , b ) 66 , c ) 76 , d ) 78 , e ) 72

Ex Output:
e