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: the area of a parallelogram is 72 sq m and its altitude is twice the corresponding base . then the length of the base is ? 
Options: a ) 6 , b ) 16 , c ) 8 , d ) 36 , e ) none
Example Output: a

Example Input: Problem: if the sides of a cube are in the ratio 4 : 3 . what is the ratio of their diagonals ? 
Options: a ) 4 : 3 , b ) 4 : 8 , c ) 4 : 1 , d ) 4 : 2 , e ) 4 : 7
Example Output: a

Example Input: Problem: if y is the smallest positive integer such that 1260 multiplied by y is the square of an integer , then y must be 
Options: a ) 25 , b ) 35 , c ) 60 , d ) 75 , e ) 140
Example Output:
b