Fact 1: Completing a circuit causes electricity to flow through that circuit.

Fact 2: Electricity is electrons in motion.

Given the two facts above, answer the question "what flows through a circuit when it is completed?" with the following options: 
- energy
 - heat energy
 - electrons
 - direct energy
 - light switch
 - neutrons
 - Solar energy
 - h2o


 

   electrons      