Problem: given two cylindrical containers - - a and b . cylinder a has a diameter of 12 meters and a height of 10 meters . cylinder b has a radius of 2 meters and a height of 4 meters . if cylinder a is filled to capacity with water , how many cylinder b will be filled to capacity with the content of cylinder a ? 
Options: ['a ) 23', 'b ) 22', 'c ) 21', 'd ) 25', 'e ) 24']
b