The period referred to in paragraph (1)(B)(ii), in the case of any widow or surviving divorced wife, is the period beginning with whichever of the following is the latest:

(A) the month in which occurred the death of the fully insured individual referred to in paragraph (1) on whose wages and self-employment income her benefits are or would be based, or

(B) the last month for which she was entitled to mother’s insurance benefits on the basis of the wages and self-employment income of such individual, or

(C) the month in which a previous entitlement to widow’s insurance benefits on the basis of such wages and self-employment income terminated because her disability had ceased,

and ending with the month before the month in which she attains age 60, or, if earlier, with the close of the eighty-fourth month following the month with which such period began.