What aspect of writing is essential for reinforcing a writer's credibility?

Incorporating relevant data to support arguments is essential for reinforcing a writer's credibility because it provides concrete evidence that strengthens the claims being made. When a writer uses statistics, research findings, expert opinions, or factual information, it demonstrates a commitment to accuracy and thoroughness in their writing. This evidence allows readers to trust the writer's assertions because they are backed by reliable sources, making the argument more persuasive and compelling.

On the other hand, while expressing a strong opinion can engage readers, it doesn't necessarily guarantee credibility unless it is supported by solid evidence. Emotional appeals may connect with readers on a personal level, but they don't inherently establish trustworthiness. Making writing as short as possible can sometimes sacrifice clarity and depth, which can detract from the writer’s ability to convey a well-supported argument. In essence, relevant data serves as the foundation upon which credibility is built in persuasive writing.