Avoiding offence: Ms.
Words that avoid giving offense: Ms.
Ms. can be used as a title for all women, whether they are married or not. Mrs. is usually only used for married women who have the same family name as their husband. Miss is used as a title for unmarried women, and sometimes married women who did not change their name when they got married, but many women prefer to use Ms. as their title. Ms. is more common in American English than British English.