We chose to make the kitchen and the living room in a parallel circuit because instead of turning both rooms on you can close one light however the other light will still be on. You also almost spend most of your time in rather those two rooms.
We chose to make the bathroom in a series circuit because the bathroom is a small place and doesn’t need to be connected to another room. You won’t use this place a lot so it’s better to use a series circuit for just one room.
We chose to make the master bedroom parallel so we can change the lightning in this room. With the switches you can stop some bulbs and change the lightness of the room. You can change it to make it bright or dim. Also it saves a lot of energy.