Из четырёх вариантов A, B, C, D выберите единственно правильный:

When I came home late in the evening, my parents
(A) had already had dinner
(C) have been having dinner
(B) have already had dinner
(D) had dinner

A) had already had dinner

Объяснение:

When I came home late in the evening, my parents had already had dinner. - Когда я пришёл домой поздно вечером, мои родители уже поужинали. (Они поели до его прихода, поэтому используем Past Perfect)