What type of circuit is in the diagram below and what will happen if two lightbulbs are placed at D & B is closed?
A. Series circuit and both lightbulbs will be on
B. Open series circuit and one lightbulb will be on and the other lightbulb will be off
C. Open parallel circuit and one lightbulb will be on and the other lightbulb will be off
D. Close parallel circuit and both lightbulbs will be on
