---postcards are there on the desk?-None.A How old B How much C How many D How long

问题补充：

---postcards are there on the desk?

---None.

A How old B How much C How many D How long

答案：

解析：四个选项分别提问年龄,钱、多少个和多久，根据答语，一个没有，选C。