Split #1a: as discussed in this post, this is a situation in which there is the same relationship, respect, between any possible pair of people in the group. This is a situation that calls for the structure "each other" or "one another." Choice (A) doesn't use this, and what it uses is very wordy and awkward, so it is incorrect.
Split #1b: these structures, "each other" and "one another," demand a plural subject. Choices (C) & (D) make the mistake of using a singular subject, so these are incorrect.
That leaves us with (B) & (E). In (E), there's a strange logical problem. The subject is "they and the others"---who are these others? The pronoun "they" refers to all the employees, so there is no one left to constitute "the others." Choice (E) is incorrect.
Choice (B) is the only possible answer.
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