which of the following is a main component of an authors argument?\nreasoning\ncomplaint\nbiography

Brief Explanations:

An author's argument typically consists of elements like a claim, evidence, and reasoning. Reasoning helps connect the evidence to the claim. A complaint is more of an expression of dissatisfaction, not a core argument component. A biography is about a person's life story, not relevant to an argument's structure.

Answer:

reasoning