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

[Q]: Problem: what is the measure of the radius of the circle inscribed in a triangle whose sides measure 4 , 11 and 12 units ? 
Options: ['a ) 1.6 units', 'b ) 6 units', 'c ) 3 units', 'd ) 5 units', 'e ) 12 units']
[A]: a


[Q]: Problem: the radius of a sphere is increased by 50 % . the increase in surface area of the sphere is : 
Options: a ) 168 , b ) 125 , c ) 186 , d ) 197 , e ) 191
[A]: b


[Q]: Problem: how many 3 x 3 x 3 cubes could fit in a 10 x 24 x 16 box ? 
Options: a ) 150 , b ) 145 , c ) 138 , d ) 142 , e ) 175
[A]:
d