The entitlement of a child of a deceased employee to an annuity under paragraph (iii) of
section 231a(d)(1) of this title shall end on (A) the last day of the month preceding the month in which he or she dies, (B) the last day of the month preceding the month in which he or she marries, (C) the last day of the month preceding the month in which he or she attains age 18 and does not meet the qualifications set forth in clause (B) or (C) of such paragraph (iii), (D) the last day of the month preceding (i) the month during no part of which he or she is a full-time elementary or secondary school student or (ii) the month in which he or she attains age 19, and does not meet the qualifications set forth in clause (A) or (C) of such paragraph (iii), or (E) the last day of the second month following the month in which he or she ceases to be disabled for purposes of such paragraph (iii) and does not meet the qualifications set forth in clause (A) or (B) of such paragraph (iii), whichever first occurs. A child whose entitlement to an annuity under paragraph (iii) of
section 231a(d)(1) of this title terminated by reason of clause (E) of this subdivision because he or she ceased to be disabled and who again becomes disabled as provided in clause (C) of such paragraph (iii), may become reentitled to an annuity on the basis of such disability upon his or her application for such reentitlement. A child whose entitlement to an annuity under paragraph (iii) of
section 231a(d)(1) of this title terminated with the month preceding the month in which he or she attained age 18, or with a subsequent month, may again become entitled to such an annuity (providing no event to disqualify the child has occurred) beginning with the first month thereafter in which he or she meets the qualifications set forth in clause (B) or (C) of such paragraph (iii), if he or she has filed an application for such reentitlement.