To determine how paragraph 4 develops the claim made in the article title "Lonesome George's Genome Offers Clues to Long Life," we should analyze the given options:
A. The section explains why turtles do not get cancer or experience inflammation.
B. The paragraph explains why humans and tortoises have similar lifespans.
C. The paragraph expands on the idea that Lonesome George had a special kind of DNA.
D. The paragraph develops the idea that researchers are interested in what it takes to live a long life.
To answer the question, the paragraph likely focuses on the unique aspects of Lonesome George's genome and how those may contribute to longevity, thereby supporting the article's title.
Thus, the most appropriate choice seems to be:
D. The paragraph develops the idea that researchers are interested in what it takes to live a long life.
This option aligns with the overarching theme of the article, which centers on understanding the genetic factors that contribute to long life, as observed in Lonesome George.