The writer wants to revise sentence 7 (reproduced below) to introduce the main idea of the paragraph. Which choice best accomplishes this goal? Later in the film, Obi-Wan sets up a Jedi Knight training exercise for Luke.
1) Obi-Wan teaches Luke how to use a lightsaber.
2) Luke discovers his true identity as a Jedi Knight.
3) Luke learns about the Force and its power.
4) Obi-Wan reveals the truth about Luke's father.