For a light bulb to light, charge must enter the threaded side of the bulb and exit out the bottom tip of the bulb OR enter the bottom tip of the bulb and exit out the threaded side of the bulb. As long as a bulb is connected in this manner to the pathway that leads from the positive terminal of the cell to the negative terminal of the cell, the bulb will be lit.
 

Requirements of a Circuit
It is sometimes said that there are two requirements for a circuit: (1) There must be a source of energy such as a battery or cell. (2) There must be a complete, conducting path that leads from the + to the - terminal fo the energy source. If a light bulb is part of this conducting path, then the light bulb will light.

How a Light Bulb Lights
A light bulb will light if charge flows through its filament. The filament is the curled wire that is located inside the glass bulb of a light bulb. The filament is connected to the side of the light bulb by a wire that supports one of its ends. The other end of the filament is supported by a wire that leads to the bottom tip of the bulb. As long as the bulb is arranged such that charge enters its side and exits out its bottom OR enters at the bottom and exits out the side, the light bulb will light. Carefully inspect each diagram to see if the light bulb is arranged in one of these two ways.