When we greet somebody , we should pay attention to the addressing form, which of the following is the correct way to address a lady whom you are not sure whether she is married or not？

When we greet somebody , we should pay attention to the addressing form, which of the following is the correct way to address a lady whom you are not sure whether she is married or not？
A.Mr.Smith
B.Miss Smith
C.Ms.Smith
D.Mrs.Smith
正确答案： Ms.Smith