A useful check for these phrase-ordering questions is to underline every pronoun in the joined sentence and ask whether they all refer consistently to the same point of view.
The joined sentence reads: "In a conflict, speak in a pleasant way, send appropriate non-verbal messages to the other person, and match your non-verbal behaviour to the spoken message."
Scanning the pronouns: phrase (a) has none, it simply states the general instruction "speak in a pleasant way". Phrase (b) refers to "the other person", again impersonal and general. Phrase (d) refers to "the spoken message", also impersonal. Phrase (c), however, uses "your non-verbal behaviour", suddenly addressing the reader directly with a second-person possessive where the rest of the sentence has stayed general and impersonal.
This kind of shift, from general description to direct address and back, is a common error type in these four-phrase questions: three phrases maintain one consistent style while a single phrase breaks the pattern. Since (a), (b) and (d) are internally consistent with each other and only (c) introduces the jarring "your", the flawed phrase is (c).
The correct answer is option 3, phrase (c).
Identify the part of the sentence that contains an error:
"Neither the manager nor the employees ___ willing to accept the new policy."