Which of the following is an effective way for a writer to demonstrate expertise?

Providing statistics and data from credible research is a powerful way for a writer to demonstrate expertise because it grounds the argument in factual evidence. This approach lends credibility to the claims being made and assures the audience that the writer has a sound understanding of the topic, supported by authentic sources. When a writer cites reliable statistics, it not only demonstrates their knowledge but also allows readers to verify the information themselves, enhancing trust in the writer's authority on the subject matter.

On the other hand, including a personal story might engage the reader emotionally, but it does not inherently showcase expertise in the same way that data does. While complex language might seem sophisticated, it can often alienate readers if not used appropriately. Avoiding references to previous research would undermine the writer’s credibility as it suggests a lack of engagement with established knowledge in the field. Therefore, presenting credible statistics and research is the clearest method of illustrating expertise to an audience.