The article says:
Vitale called the invention a "package saver" at first. But now it's called a pizza saver. Some call it a pizza table. It's just a small piece of plastic. It looks like a small dollhouse table. The pizza saver sits in the middle of a pizza. It keeps the box lid from touching the pizza.
Why is this passage in the article? It shows __________.
A.how Vitale's invention works
B.how dollhouses are made
C.why Vitale changed pizza
D.why pizza is hard to make