6. Read the following sentences: "Lasers are simply light sources that, unlike other kinds of light, are concentrated together. In other words, they are rays of light that are controlled and focused into a chosen area." Why does the author use the phrase in other words above? A. to describe how the characters in the story are feeling B. to convince readers that they should look up the words "sources"and "rays" C. to prove that most people do not understand how lasers work D. to show that the same idea is going to be explained in a new way