A is a person who has never married.​

spinster, bachelor

Explanation:

in the United States, "spinster" is the legal term used to refer to a woman who has never married, just as the male counterpart of "bachelor" refers to a man who has never married. Once men and women are married, they can never revert to the state of "never married". These legal terms bear no other connotations

spinster

Explanation:

In the United States, "spinster" is the legal term used to refer to a woman who has never married, just as the male counterpart of "bachelor" refers to a man who has never married