The cone that fits exactly inside the cylinder has the same radius and height of the cylinder
so the radius of a cone = r = 4
and the height of a cone = h = 6
So,
The volume of a cone =(1/3) π r² h
= π * 4² * 6
= (1/3)( 3.14 ) ( 4^2 )( 6 )
so the answer will be a