To accurately analyze how paragraph 4 develops the claim made in the article title, we need to identify the main focus of the paragraph. Based on the options provided, it seems that the most relevant choice would be:
The paragraph develops the idea that researchers are interested in what it takes to live a long life.
This option aligns with the theme of understanding longevity, which is often a central claim in discussions about organisms that exhibit unusual lifespans, such as tortoises.