Choose your answer from:
A). emptying
B). O3
C). copper
D). flow
E). motion
F). stasis
G). deletion
H). energy

You are presented with the quiz "A switch is used to start the what of electric charge in an electrical circuit?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "aswitch is used to start the flow of current in an electrical circuit" and "an electrical current is the flow of electric charge". So, what's the best answer to the question?
Answer:
D).