These passages belong to the novel "The Cay" written by Theodore Taylor and published in 1969.
The passage that best supports the story's topic of survival is Passage B: "I was starting to be less dependent on the vine rope, and sometimes it seemed to me that Timothy was trying hard to make me independent of him".
In this passage, Timothy's objective is expressed. He wants Phillip to be independent; otherwise, he will not survive after Timothy is gone. Throughout the story, the theme of survival remains present. The reader learns many survival techniques which are shown by Timothy.