Fact 1: Powering an electrical device with a battery requires a path for electricity to flow through a closed circuit.

Fact 2: Electrons flow continuously in a closed circuit.

Given the two facts above, answer the question "powering an electrical device with a battery requires a path for electrons to what?" with the following options: 
- hydrogen and oxygen
 - spread out
 - electromagnetic energy
 - cut the line
 - flow continuously
 - an electron microscope
 - flood
 - kinetic energy


 

     flow continuously    