Lord Byron's work "Don Juan'' is the work that would be the best example to provide his writing style as it relates to humor. In the said piece, he employs humor through the narrator's amused tone of voice in the story as he follows along the plotline.
The answer is B. "He asked himself where it had come from and how; the past provided no explanation, and the future could not justify it."
This option is not a dark humor because it does not show the opposite side of happiness. The other choices explain that although there is happiness, he considered it as a burden- making it a dark humor.