阅读下面材料，从每题所给的A、B、C、D四个选项中选中最佳选项。

Li Ming is a student in Grade Five. He is ten years old. He comes from Rizhao, Shandong. He has a new room. A desk, a bookcase, a closet(衣柜), a chair and a bed are in the room. Look! Some books are on the desk and some are in the bookcase. Some clothes are in the closet and some are on the bed. His schoolbag is under the bed. On the chair, you can see a clock.

Where is his baseball? Oh, look! It is on the floor(地板). And his toys are on the floor, too. His mother comes in and says to him. "The things in your room are everywhere. Your room is not tidy. It isa mess."

"I'm sorry, Mom. I will clean it." Li Ming says to his mother.