An old unmarried woman

A. Virgin

B. Bachelor

C. Spinster

D. Matron

Answer: Option C

Solution(By Examveda Team)

One word substitute is Spinster.

Virgin: a person who has never had sexual intercourse.
Bachelor: a man who is not and has never been married.
Spinster: an unmarried woman, typically an older woman beyond the usual age for marriage.
Matron: a woman in charge of domestic and medical arrangements at a boarding school or other institution.