No they are not the same material because having the same density doesnt mean its the same material also they can have a different density and be the same material
The answer is number (3) if am wrong am sry
Components connected in series are connected along a single path, so the same current flows through all of the components. If the light bulbs are connected in parallel, the currents through the light bulbs combine to form the current in the battery, while the voltage drop is across each bulb and they all glow.
