-a tool with precise criteria to evaluate a particular assignment
Answer:
1.
Explanation:
Valediction is the act of saying farewell.
You didn't provide us with the text.
Twain accomplishes his purpose chiefly through telling a story within a story, also called a "frame story".
The best reason a formal tone and language should be used in a professional electronic communication is because informal communications are more easily misinterpreted. The correct answer is A.