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

Input: Consider 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

Output: b


Input: Consider Input: Problem: the slant height of a cone is 14 cm and radius of the base is 12 cm , find the curved surface of the cone . 
Options: a ) 150 , b ) 170 , c ) 48 , d ) 528 , e ) 600

Output: d


Input: Consider Input: Problem: a small table has a length of 12 inches and a breadth of b inches . cubes are placed on the surface of the table so as to cover the entire surface . the maximum side of such cubes is found to be 4 inches . also , a few such tables are arranged to form a square . the minimum length of side possible for such a square is 20 inches . find b . 
Options: a ) 8 , b ) 16 , c ) 4 , d ) 32 , e ) 48


Output: c