Read the excerpt from Last Lecture. There are 50 students drawn from all the different departments of the university. There are randomly chosen teams, four people per team, and they change every project. A project only lasts two weeks, so you do something, you make something, you show something, then I shuffle the teams, you get three new playmates and you do it again. . . .

The first assignment, I gave it to them, they came back in two weeks and they just blew me away. I mean the work was so beyond, literally, my imagination, because I had copied the process from Imagineering’s VR lab, but I had no idea what they could or couldn’t do with it as undergraduates, and their tools were weaker, and they came back on the first assignment, and they did something that was so spectacular that I literally didn’t, ten years as a professor and I had no idea what to do next. So I called up my mentor, and I called up Andy Van Dam.
What is the organizational structure of this section of the speech?
A. chronological ordering
B. compare and contrast
C. cause and effect
D. problem and resolution