I think it is C because A is missing commas, B doesn't need them and D doesn't need one.
A
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B.“But losing her had, I suppose, made him realize for the first time how much he loved her, and this sudden strength — focus, certainty, whatever — was a comfort”
Explanation:
In this short story by George Saunders, the main character Uncle Matt is shown to be crude, materialistic and with no emotional connection maintained throughout his course of life.
With his actions and attributes, he seems to have a negligence over his children. In the story's start, Saunders describes his actions and thoughts clearly for readers to understand that he does not really have a genuine concern over children well-being.
It is a surprising truth for readers to digest when he suddenly turns into an emotional father during the mishap. When he starts to understand his responsibility and how caring his children were towards him, in spite of his attitude towards them and their lives, he realizes that he must act differently, in a more concerned and responsible way to get her back.
