— I’m sorry I didn’t make it to your party last night. — I know you’re busy these days. A

问题补充：

— I’m sorry I didn’t make it to your party last night.

—, I know you’re busy these days.

A. Of course

B. No kidding

C. That’s all right

D. You are welcome

答案：

A. Of course

B. No kidding

(答案→)C. That’s all right

D. You are welcome

解析：考察交际用语。A当然；B不开玩笑；C没关系；D不用谢；句意：—真是对不起，我昨天没有能够去参加你的聚会。—没关系，我知道你这些日子很忙。根据句意说明是对道歉的回答。故C正确。