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Answer:
a. Planning
Explanation:
The one that should not be avoided would be planning. Planning is incredibly important and can help organize a thought so that it is short, effective, and makes sense. All of which will help the listener completely understand what is being said. Without proper planning, a communication can begin to easily unravel and/or split off into unrelated topics which would make the overall point of the communication impossible to understand. Therefore, planning should not be avoided if possible.