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 the quadrilateral of one of its diagonals is 24 cm and its off sets 9 cm and 6 cm ? 
Options: a ) 180 cm 2 , b ) 150 cm 2 , c ) 168 cm 2 , d ) 198 cm 2 , e ) 987 cm 2
Example Output: a

Example Input: Problem: the diagonal of a rhombus are 25 m and 50 m . its area is : 
Options: a ) 900 , b ) 800 , c ) 700 , d ) 625 , e ) 650
Example Output: d

Example Input: Problem: how much space , in cubic units , is left vacant when maximum number of 6 x 6 x 6 cubes are fitted in a rectangular box measuring 12 x 18 x 14 ? 
Options: a ) 428 , b ) 429 , c ) 430 , d ) 431 , e ) 432
Example Output:
e