-------Hi Mary who is this girl?-------She is my friend’s sistername is Gina Green. A

问题补充：

-------Hi, Mary, who is this girl?

-------She is my friend’s sister. name is Gina Green.

A His B Her C Hers D Its

答案：

解析：句意：你好，玛丽，这个女孩是谁？她是我朋友的姐姐，她的名字叫吉纳·格林。girl女孩，形容词性物主代词用her她的，来指代，故选B