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

Example Input: Problem: find the area of a parallelogram with base 24 cm and height 16 cm .
Options: a ) 379 , b ) 384 , c ) 345 , d ) 342 , e ) 376
Example Output: b

Example Input: Problem: the number 42 can be written as the sum of the squares of 3 different positive integers . what is the sum of these 3 integers ?
Options: a ) 17 , b ) 10 , c ) 15 , d ) 14 , e ) 13
Example Output: b

Example Input: Problem: 65 small identical cubes are used to form a large cube . how many more cubes are needed to add one top layer of small cube all over the surface of the large cube ?
Options: ['a ) 64', 'b ) 128', 'c ) 151', 'd ) 216', 'e ) 256']
Example Output:
c