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: what will be the area of a semi - circle of 14 metres diameter ? 
Options: ['a ) 154 sq metres', 'b ) 77 sq metres', 'c ) 308 sq metres', 'd ) 22 sq metres', 'e ) none of these']

Output: b


Input: Consider Input: Problem: the volume of a sphere with radius r is ( 4 / 3 ) * pi * r ^ 3 and the surface area is 4 * pi * r ^ 3 . if a sperical balloon has a volume of 36 pi cubic centimeters , what is hte surface area of the balloon in square centimeters ? 
Options: a ) a . 40 , b ) b . 100 , c ) c . 400 , d ) d . 1,000 , e ) e . 10,000

Output: b


Input: Consider Input: Problem: what is the smallest positive integer x such that 450 x is the cube of a positive integer ? 
Options: a ) 2 , b ) 15 , c ) 30 , d ) 60 , e ) 120


Output: c