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 the largest circle that can be drawn inside a square of side 70 cm in length is : 
Options: ['a ) 3600', 'b ) 2646', 'c ) 3850', 'd ) 4215', 'e ) 5205']
Example Output: c

Example Input: Problem: the diagonal of a rhombus are 65 m and 60 m . its area is : 
Options: a ) 1940 , b ) 1950 , c ) 1960 , d ) 1990 , e ) 1980
Example Output: b

Example Input: Problem: the volume of the sphere qq is ( dfrac { 37 } { 64 } % ) less than the volume of sphere pp and the volume of sphere rr is ( dfrac { 19 } { 27 } % ) less than that of sphere qq . by what is the surface areaof sphere rr less than the surfacearea of sphere pp ? 
Options: ['a ) 50 %', 'b ) 60 %', 'c ) 75 %', 'd ) 80 %', 'e ) 89 %']
Example Output:
c