Which sentence phrase in this passage from the killer in our midist is the most casual?

Which sentence correctly uses a normative case pronoun

Read this sentence from "the wife's lament

Read this passage.my career in journalism has taught me the challenges of capturing sporting events, yet gregor powell's descriptions are flawless. powell is a gold-medal paralympic swimmer, but his memoir proves that his true strength is the power of his insights.what feature distinguishes this passage as a foreword?