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

Ex Input:
Problem: what is log 3 ( 4 ) log 4 ( 5 ) . . . log 80 ( 81 ) ? 
Options: a ) 1 , b ) 4 , c ) 81 , d ) log 80 243 , e ) e 81

Ex Output:
b


Ex Input:
Problem: if log 2 = 0.3010 and log 3 = 0.4771 , the value of log 5 ( 512 ) 
Options: a ) 3.876 , b ) 2.967 , c ) 2.87 , d ) 3.912 , e ) 1.9

Ex Output:
a


Ex Input:
Problem: in a certain school , the ratio of boys to girls is 5 to 13 . if there are 128 more girls than boys , how many boys are there ? 
Options: a ) 27 , b ) 36 , c ) 45 , d ) 72 , e ) 80

Ex Output:

e