Answer:
B: path for electrons to travel like a wire
D: power source
Step-by-step explanation:
Electric circuits must have a path for electrons to travel in order to work properly. This is typically provided by a wire or other conductor that allows the electrons to flow through the circuit. In addition, electric circuits must have a power source in order to work properly. This can be a battery, a generator, or another device that supplies the necessary energy to drive the flow of electrons through the circuit. Other components, such as light bulbs or switches, may also be included in an electric circuit, but they are not necessary for the circuit to function.