根据对话内容，选择正确答案。

Mum: It's 7:00. It's time to get up, Sarah. Breakfast is ready.

Sarah: What day is it today, Mum.

Mum: It's Sunday. What do you do on Sundays?

Sarah: I often play ping-pong with my friend, Chen Jie.

 Mum: OK. And?

Sarah: My friend Lily asks me to go shopping.

Mum: That's good. And?

Sarah: I do my homework. What do you do on Sundays?

Mum: I wash clothes.

Sarah: I'll help you, Mum.

Mum: You are a thoughtful girl!

Sarah: Thank you, Mum.