For purposes of paragraph (1), the term “eligible disabled widow or widower” means an individual who—
(A)#
was entitled to a monthly insurance benefit under subchapter II for December 1983,
(B)#
was entitled to a widow’s or widower’s insurance benefit based on a disability under section 402(e) or (f) of this title for January 1984 and with respect to whom a benefit under this subchapter was paid in that month, and
(C)#
because of the increase in the amount of his or her widow’s or widower’s insurance benefits which resulted from the amendments made by section 134 of the Social Security Amendments of 1983 ( Public Law 98–21 ) (eliminating the additional reduction factor for disabled widows and widowers under age 60), was ineligible for benefits under this subchapter in the first month in which such increase was paid to him or her (and in which a retroactive payment of such increase for prior months was not made).