The correct answer is option d. making a claim about America's national parks and giving examples to support the claim.
The author of the passage adopts a structure characterized by making a claim about America's national parks and subsequently providing examples to substantiate that claim. Throughout the text, the author articulates a central argument or viewpoint regarding the significance, challenges, or unique features of America's national parks. Following the presentation of each claim, the author seamlessly integrates illustrative examples, anecdotes, or supporting evidence to fortify the stated assertions.
This method of organization allows the author to build a persuasive narrative by guiding the reader through a series of interconnected ideas and reinforcing the main points with concrete instances or data. Rather than presenting a chronological sequence of events (option a), engaging in comparisons and contrasts (option b), or describing and solving problems (option c), the author focuses on articulating a thesis about America's national parks and buttresses it with relevant and compelling examples.
In summary, the author employs a structure where claims about America's national parks are made and subsequently supported with examples, creating a cohesive and persuasive presentation. Therefore, the correct answer is d. making a claim about America's national parks and giving examples to support the claim.