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: if the perimeter of acd is 9 + 3 3 , what is the perimeter of equilateral triangle abc ?
Options: ['a ) 9', 'b ) 18 3 3', 'c ) 18', 'd ) 18 + 3 3', 'e ) 27']
[A]: c

[Q]: Problem: what is the max number of rectangular boxes , each measuring 4 inches by 6 inches by 10 inches , that can be packed into a rectangular packing box measuring 16 inches by 18 inches by 30 inches , if all boxes are aligned in the same direction ?
Options: ['a ) 36', 'b ) 14', 'c ) 12', 'd ) 15', 'e ) 11']
[A]: a

[Q]: Problem: the measurement of a rectangular box with lid is 25 cmx 18 cmx 18 cm . find the volume of the largest sphere that can be inscribed in the box ( in terms of cm 3 ) . ( hint : the lowest measure of rectangular box represents the diameter of the largest sphere )
Options: a ) 288 , b ) 48 , c ) 72 , d ) 972 , e ) 964
[A]:
d