PLZ HELP ASAP ROTATE 2D SHAPES IN 3D

The solid 3D object that produced by rotating the triangle a bout line m.
The correct choice is (c)
A cone with radius 8 units

because the vertex that exist on line m will not changed that represent the vertex of the cone
and the base of the triangle will represent the diameter of the cone will be equal = 16
So the radius will be equal 8
and the height of the cone will be equal 6