阅读下面材料，从每小题所给的A、B、C、D四个选项中选出一个最佳选项。

In the English class, Mrs Brown tells her students a story:

This is Blue. He has four good friends at school. They are Red, Yellow, Green and White. And his best friend is Yellow. They like to play together after school.

One Saturday, Blue's mum goes shopping . She says to Blue, "You can't go with me, Blue. Stay at home. " But Blue doesn't listen to her. He goes to play with Yellow. When they meet, Blue hugs Yellow and they become green. They play and play and the evening comes. When it is dark, they go home.

But Blue's mum says,"You are not my Blue. You are Green. " And Yellow's mum says to Yellow,"You are not my Yellow. "

What happens later? Come to Mrs Brown's class and listen to the story in the next class.