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 triangle is with base 10 m and height 5 m ? 
Options: a ) 11 , b ) 25 , c ) 787 , d ) 122 , e ) 12
Example Output: b

Example Input: Problem: a math teacher has 24 cards , each of which is in the shape of a geometric figure . half of the cards are rectangles , and a third of the cards are rhombuses . if 8 cards are squares , what is the maximum possible number of cards that re circles . 
Options: a ) 7 , b ) 10 , c ) 11 , d ) 12 , e ) 13
Example Output: a

Example Input: Problem: if k and w are the dimensions of a rectangle that has area 21 , and if k and w are integers such that k > w , what is the total number of possible values of k ? 
Options: a ) two , b ) three , c ) four , d ) five , e ) six
Example Output:
a