The correct option is C allows all other lamps to remain lit even if one lamps fails
Answer is C.
Components connected in parallel are connected so the same voltage is applied to each component. In a parallel circuit, the voltage across each of the components is the same, and the total current is the sum of the currents through each component.
In parallel circuits, each light has its own circuit, so all but one light could be burned out, and the last one will still function. A circuit composed solely of components connected in parallel is known as a parallel circuit.
In this case, the lamps for lighting in side the rooms of a hotel are connected in parallel.
This is done so, because, this arrangement of the circuit allows all other lamps to remain lit even if one lamps fails.