The lawyer says: "Although not a lawyer, Mr. Burr strove for such authenticity that we feel as if we lost one of our own.”
It clearly shows when the lawyer states the above words, he knows that Mr. Burr was only an actor. So his claim of Mr. Burr as one of them is only a way to praise the actor, but not to accept him as a colleague.
Hence, A B C D have nothing to do with the argument that "some legal professionals are losing their ability to distinguish fiction from reality". In other words, ABCD are irrelevant.
Therefore, the only correct answer is E.
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呃 是这样的 律师说“Although not a lawyer”就指E选项里面说的被忽略掉的part 因为这清楚的表明他已经知道Mr. Burr不是演员 也就是说他并没有将fiction和reality混淆