Situation: A introduces his mother to B.
Speaker A: This is my mother, Mrs. Wang.
Speaker B: _______________.
选择一项：
a. Nice to meet you! 解析：Nice to meet you! 很高兴见到你；Thanks多谢；OK好吧；Sorry抱歉。根据上文，王老师，这是我的母亲。可知选A最符合语境。
b. OK
c. Sorry
d. Thanks