Problem: the height of two right circular cones are in the ratio 1 : 2 and their perimeters of their bases are in the ratio 3 : 4 , the ratio of their volume is ? 
Options: ['a ) 9 : 38', 'b ) 9 : 31', 'c ) 9 : 32', 'd ) 9 : 39', 'e ) 9 : 35']
c