Read this excerpt from "Rules of the Game:" They were already lining up the chess pieces and reading from the dog-eared instruction book.

How does the use of the word dog-eared affect the meaning of the text?

It shows that no one is careful with the instruction book.

It implies that the instruction book is missing some pages.

It shows that the chess set is a very decent present.

It emphasizes the fact that the chess set is old and well used.