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

Ex Input:
Problem: a spirit and water solution is sold in a market . the cost per liter of the solution is directly proportional to the part ( fraction ) of spirit ( by volume ) the solution has . a solution of 1 liter of spirit and 1 liter of water costs 30 cents . how many cents does a solution of 1 liter of spirit and 2 liters of water cost ? 
Options: a ) 13 , b ) 30 , c ) 50 , d ) 51 , e ) 52

Ex Output:
b


Ex Input:
Problem: what is the perimeter of a square field whose diagonal is 8 √ 2 ? 
Options: a ) 82 m , b ) 32 m , c ) 27 m , d ) 26 m , e ) 76 m

Ex Output:
b


Ex Input:
Problem: what is the area of a square field whose diagonal of length 20 m ? 
Options: ['a ) 288', 'b ) 289', 'c ) 200', 'd ) 112', 'e ) 178']

Ex Output:

c