详解
Choice B is the best answer. The first sentence of the passage explains that people do not like to admit when they've chosen the wrong profession and that they will continue in their profession for a while before admitting their unhappiness. This statement mirrors the narrator's own situation, as the narrator admits he finds his own occupation "irksome"(line 7,"felt...the") but that he might "long have borne with the nuisance" (line 10,"I...nuisance") if not for his poor relationship with his employer.
Choices A, C, and D are incorrect because the first sentence does not discuss a controversy, focus on the narrator's employer, Edward Crimsworth, or provide any evidence of malicious conduct.