The term “widow” (except when used in the first sentence of section 402(i) of this title ) means the surviving wife of an individual, but only if (A) she is the mother of his son or daughter, (B) she legally adopted his son or daughter while she was married to him and while such son or daughter was under the age of eighteen, (C) he legally adopted her son or daughter while she was married to him and while such son or daughter was under the age of eighteen, (D) she was married to him at the time both of them legally adopted a child under the age of eighteen, (E) except as provided in paragraph (2), she was married to him for a period of not less than nine months immediately prior to the day on which he died, or (F) in the month prior to the month of her marriage to him (i) she was entitled to, or on application therefor and attainment of age 62 in such prior month would have been entitled to, benefits under subsection (b), (e), or (h) of section 402 of this title , (ii) she had attained age eighteen and was entitled to, or on application therefor would have been entitled to, benefits under subsection (d) of such section (subject, however, to section 402(s) of this title ), or (iii) she was entitled to, or upon application therefor and attainment of the required age (if any) would have been entitled to, a widow’s, child’s (after attainment of age 18), or parent’s insurance annuity under section 231a of title 45 .