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: sides of a triangle are 13 cm . 14 cm . and 15 cm . respectively . calculate the area of triangle .
Options: ['a ) 80', 'b ) 82', 'c ) 84', 'd ) 86', 'e ) 88']

Ex Output:
c

Ex Input:
Problem: v is the volume of a cylinder ; the radius of the cylinder is 3.5 . the height of the cylinder is 650 % more than the radius . which of the following is true ?
Options: ['a ) 100 < v < 300', 'b ) 300 < v < 500', 'c ) 500 < v < 700', 'd ) 700 < v < 900', 'e ) 900 < v < 1100']

Ex Output:
d

Ex Input:
Problem: what will be the percentage increase in the area of the cube ' s surface if each of the cube ' s edges grows by 40 % ?
Options: a ) 95 % , b ) 90 % , c ) 85 % , d ) 96 % , e ) 25 %

Ex Output:
d