The following text is for questions 33 to 37.

Aldo is in a supermarket now.

Aldo: Hi! Donna! What are you doing here?

Donna: Hi, Aldo. Well, I'm helping my parents in this store.

Aldo: Oh, what do you sell?

Donna: We have the best collection of stationery.

Aldo: Really?

Donna: Yeah. By the way, why are you here?

Aldo: Oh, I'm looking for a new backpack. I need a bigger one.

Donna: What a coincidence! We have a lot of backpacks in the store. Let's go there.

Aldo: OK. Well, I hope your parents are going to give me a big discount.

Donna: I believe they will.

Which one is backpack?