Which sentence best describes the main idea of this passage?
A. When a bug lands in a spider web, it is probably going to be eaten by a spider.
B. It is hard to get a spider web off of your fingers because it is so sticky.
C. There are many reasons why spiders do not get stuck in their own webs.
D. Spiders are a lot smarter than you might think.
D. I, II, and III