in an argumentative essay, what tone should the author use?\n a light, informal tone\n a dull, serious…

Brief Explanations:

Argumentative essays are academic works presenting arguments and evidence. They require a formal and objective tone to convey credibility and respect for the audience and topic. A light, informal, friendly - humorous tone is too casual, and a dull, serious tone is not necessarily appropriate. A formal, academic tone helps in clearly and effectively presenting ideas.

Answer:

a formal, academic tone