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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"Slang" are words that are new, flashy, and popular for only a short time
