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

Example input: Problem: in a throw of a coin find the probability of getting a tail ? 
Options: a ) 1 / 2 , b ) 1 / 3 , c ) 1 / 4 , d ) 2 / 5 , e ) 2 / 7
Example output: a
Example explanation: "s = { h , t } e = { t } p ( e ) = 1 / 2 answer is a"
Q: Problem: how many cubes of 5 cm edge can be cut out of a cube of 20 cm edge 
Options: a ) 36 , b ) 64 , c ) 216 , d ) 484 , e ) none of these
A:
b