(A) A year shall not be counted as the year of an individual’s death or eligibility for purposes of this subsection or subsection (i) in any case where such individual was entitled to a disability insurance benefit for any of the 12 months immediately preceding the month of such death or eligibility (but there shall be counted instead the year of the individual’s eligibility for the disability insurance benefit or benefits to which he was entitled during such 12 months).

(B) In the case of an individual who was entitled to a disability insurance benefit for any of the 12 months before the month in which he became entitled to an old-age insurance benefit, became reentitled to a disability insurance benefit, or died, the primary insurance amount for determining any benefit attributable to that entitlement, reentitlement, or death is the greater of— (i) the primary insurance amount upon which such disability insurance benefit was based, increased by the amount of each general benefit increase (as defined in subsection (i)(3)), and each increase provided under subsection (i)(2), that would have applied to such primary insurance amount had the individual remained entitled to such disability insurance benefit until the month in which he became so entitled or reentitled or died, or (ii) the amount computed under paragraph (1)(C).

(C) In the case of an individual who was entitled to a disability insurance benefit for any month, and with respect to whom a primary insurance amount is required to be computed at any time after the close of the period of the individual’s disability (whether because of such individual’s subsequent entitlement to old-age insurance benefits or to a disability insurance benefit based upon a subsequent period of disability, or because of such individual’s death), the primary insurance amount so computed may in no case be less than the primary insurance amount with respect to which such former disability insurance benefit was most recently determined.