7Derek nodded, still wary of his brother’s apparatus. He wasn’t sure that he wanted some machine toying with his subconscious while he slept like a baby. However, Derek remembered the reason why he had asked his brother about the Dream Machine in the first place. His history class was creating a Web site about the ancient Olympic Games and Derek had to write about the stadion. He had yet to pen a single word, and his presentation was due the following day.

8Derek took a deep breath and picked up the helmet. He programmed the following information: 776 B. C.E., Olympia, Greece, stadion. Then he placed the clunky machine on his head, fastened the strap, and tried to get comfortable in his bed. Eventually, he drifted off to sleep. . . .

9Derek stood in the stadion, the place where ancient Greeks held athletic contests. He watched as the athletes prepared to run a race, which was also called the stadion. The stadion was one of the most important events of the ancient Olympics. The length of the race was one stade—about 200 yards—which was the distance from one end of the stadion to the other. The people next to Derek talked excitedly about the great honor that would come to the man who won the race. Derek cheered along with them as the athletes sprinted to the finish line. . . .

10The next morning, Derek proudly presented his information about the stadion to his classmates. Even Mr. Jovavitch, the history teacher, looked impressed with the thorough description.
The author uses paragraphs eight, nine, and ten

A) to explain how the Dream Machine brought Derek back from ancient Greece.
B) to illustrate how to program the Dream Machine to take someone into the past.
C) to show that Derek succeeded in using the Dream Machine to complete his project.
D) to demonstrate that Derek’s presentation was better than those of his classmates.