Many people believe that television makes a person less intelligent, but that's not true. In fact, people who watch television are more informed about the world. A study found that subjects who regularly watched the World History Channel answered questions correctly 10 percent more often, on average, than those who didn't watch the channel. What claim is the author making in the passage ?
A. Watching television is a complete waste of time.
 B. Watching television makes people more intelligent.
 C. People who watch more television are better at tests.
 D. People are aware that television is a good source of information.