Problem: a cylinder with 6 meter radius and 12 meter height is filled to capacity with water . if the content of the cylinder is used to fill several smaller cylinders of 4 meter diameter and 8 meter height , how many smaller cylinders will be filled to capacity ? 
Options: ['a ) 13', 'b ) 12', 'c ) 4', 'd ) 16', 'e ) 18']
a