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: a circular garden is surrounded by a fence of negligible width along the boundary . if the length of the fence is 1 / 3 of th area of the garden . what is the radius of the circular garden ? 
Options: a ) 6 , b ) 2 , c ) 4 , d ) 8 , e ) 16
Example Output: a

Example Input: Problem: the diameter of a cylindrical tin is 14 cm and height is 2 cm . find the volume of the cylinder ? 
Options: a ) 33 , b ) 45 , c ) 66 , d ) 77 , e ) 98
Example Output: e

Example Input: Problem: the edge of a cube is 5 a cm . find its surface ? 
Options: a ) 150 a 2 cm 2 , b ) 170 a 2 cm 2 , c ) 125 a 2 cm 2 , d ) 175 a 2 cm 2 , e ) 120 a 2 cm 2
Example Output:
a