d. that he was afraid to look at the faces of the dead.
in "good form," o'brien makes a distinction between story-truth (the reality of how something was felt, and how it is told) and happening-truth (what actually happened). he tells us that sometimes, story-truth is a lot more real than happening-truth. in this case, the happening-truth is that he was too afraid to look at the faces of the dead. the story-truth, however, is that by doing so, he killed them.
i used to know but i learned it a long time ago sorry
i think the answer your looking for is