He says ," I wants to buy this book." \ He says that he wanted to buy this book. He said that he wants to buy this book. He told that he wanted to buy this book. He says that he wants to buy that book.

Explanation:

Out of all the available options the correct one would be

He said that he wants to buy this book.

This is because by using the word "said" you are stating something that already happened which was the comment made by the customer. But by using the word "this" you are making connecting the comment to an object which would be the book.

post the picture, without it i cant answer it. : )