In an argumentative essay, what tone should the author use? a light, informal tone a dull, serious tone a formal, academic tone a friendly, humorous tone

A serious tone/formal would be your best option.

Answer: A formal, academic tone.

Explanation:

An argumentative essay intends to develop a specific claim about a subject, providing evidence to sustain a certain position. Argumentative essays require a formal, academic tone that provides information aimed to prove a certain idea while maintaining a professional tone. When research has been used, sources have to be properly cited.