It can be inferred that the reason that causes Trysdale to finally break free of his mental flashback is: "The voice of the other man in the room interrupted his thoughts and roused him back to reality" (Option B)
An inference is a logical resolution that is arrived at after having examined the details of a story or text rationally.
In the short story "Cactus", Trysdale is the Protagonist. In the excerpt referenced, he had just existed a wedding and was thinking back about his past relationship with the bride.
He had told a lie which he thought was harmless but which ended the relationship with the woman he loved.
Thus, it is correct to state that the reason that causes Trysdale to finally break free of his mental flashback is Option B
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