Answer:
E. Intelligence and Intensity
Explanation:
The book mentions Walt's intensity and his intelligence. When Jon Krakauer goes to speak with Walt McCandless, he notes: "the set of his [Walt's] jaw betrays an undercurrent of nervous energy...there is no mistaking from whence Chris's intensity came". They also note several times at the intelligence of Mr. McCandless, and that of Chris is noted by several people throughout the book.
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The Olive Tree is associated with Athena, Goddess of Wisdom and War. She made it as a gift to the humans, in a fight with Poseidon over a city. She won, and the city was named after her.(Athens)