Based on the fact that the soldier enjoyed some of his actions in war, he ended up concluding that d. He was mentally ill.
The soldier in this excerpt, was thinking about the actions that he perpetrated in wartime such as the innocent killing of civilians.
The soldier ended up thinking about how he enjoyed some of these actions which made him feel terrible.
He ended up believing that he was mentally ill because most humans would not enjoy the suffering of others while inflicting pain on them.
In conclusion, option D is correct.
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