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Which of the following is a standard guideline for business emails? A. Expressing emotions, such as humor, is encouraged. B. Never write an email with just a few paragraphs. C. Write in all caps if the message is important. D. Always include a clear subject line.

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D always include a clear subject line 
 the others are not buisness like
Hey there!

Your answer is option D.
In a business email, you should always include a clear subject line. Including a clear subject line is a standard guideline for them.

Hope this helps you.
Have a great day!