Given the task definition, example input & output, solve the new input case.
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: Problem: if the sides of a triangle are 20 cm , 12 cm and 16 cm , what is its area ? 
Options: a ) 70 , b ) 79 , c ) 85 , d ) 96 , e ) 92
Output: d
"Based on the pythagorean theorem, the triangle with sides 20 cm, 12 cm and 16 cm is right angled, where the hypotenuse is 20 cm. area of the triangle = 1 / 2 * 12 * 16 = 96 cm 2 answer : option d"

New input case for you: 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