根据各组对话内容，从下面方框中提供的5个选项中选出能填入空白处的最佳选项。
A. It was great. B. What"s the matter C. How about the green one
D. Are you free tomorrow E. Thanks, but I am full. A: Helen. The happy weekend is coming. ______
B: Yes. I"m not busy at all. I"ve already finished my homework.