(A) Except as provided in subparagraphs (B) and (C), such parent’s insurance benefit for each month shall be equal to 82½ percent of the primary insurance amount of such deceased individual.

(B) For any month for which more than one parent is entitled to parent’s insurance benefits on the basis of such deceased individual’s wages and self-employment income, such benefit for each such parent for such month shall (except as provided in subparagraph (C)) be equal to 75 percent of the primary insurance amount of such deceased individual.

(C) In any case in which— (i) any parent is entitled to a parent’s insurance benefit for a month on the basis of a deceased individual’s wages and self-employment income, and (ii) another parent of such deceased individual is entitled to a parent’s insurance benefit for such month on the basis of such wages and self-employment income, and on the basis of an application filed after such month and after the month in which the application for the parent’s benefits referred to in clause (i) was filed, the amount of the parent’s insurance benefit of the parent referred to in clause (i) for the month referred to in such clause shall be determined under subparagraph (A) instead of subparagraph (B) and the amount of the parent’s insurance benefit of a parent referred to in clause (ii) for such month shall be equal to 150 percent of the primary insurance amount of the deceased individual minus the amount (before the application of section 403(a) of this title ) of the benefit for such month of the parent referred to in clause (i).