The way to avoid email communication problems is, be brief.
Brief is being short and just focusing on the main points of a subject.
Because email is a computer based communication application that is used to exchange messages among users. Email should be brief because a brief email takes short period of time and in return take lesser time to response. Emails are like business letter, they should be clear and be brief, as in the body of the email should be direct and informative, and the mail should be concise with effective points and should allow the responder to react on the email quickly.
Hence the correct option is, a. be brief
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