根据对话内容，选择最佳答案。

Chen Jie: Good morning, John. How are you?

John: Fine, thank you. Chen Jie, this is my friend Ben.

Chen Jie: Nice to meet you.

Ben: Nice to meet you, too.

John: Let's paint. I have a red crayon.

Ben: I have a green crayon and a yellow crayon.

Chen Jie: I have a blue crayon. Let's paint.

Ben: We paint a flower! It has four colours.