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

Input: Consider Input: Problem: a rectangular block 10 cm by 20 cm by 30 cm is cut into an exact number of equal cubes . find the least possible number of cubes ? 
Options: a ) 6 , b ) 10 , c ) 15 , d ) 40 , e ) 22

Output: a


Input: Consider Input: Problem: the number 155 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 ) 16 , c ) 15 , d ) 14 , e ) 21

Output: e


Input: Consider Input: Problem: the area of an isosceles trapezoid with sides of length 5 and bases of length 10 and 16 is ? 
Options: a ) 48 , b ) 40 , c ) 52 , d ) 54 , e ) 58


Output: c