The maxim of manner encourages one to:

The maxim of manner is a principle derived from Grice's conversational maxims, which are guidelines to facilitate effective communication. This particular maxim promotes clarity in conversation, suggesting that speakers should aim to express themselves in a way that is understandable, avoiding ambiguity and obscurity. Being brief is also an important aspect, as it encourages communicators to convey their message without unnecessary elaboration.

In this context, emphasizing clarity and conciseness aligns with the goal of effective communication. Using straightforward language helps listeners grasp the intended meaning, reducing the likelihood of misunderstandings. Thus, the guidance to "be clear, avoid obscurity and ambiguity, and be brief" is foundational to productive dialogue. The other options diverge from this principle, either complicating communication or neglecting clear expression altogether.