in which of the following sentences from into te wild is the authors tone evident

ust upstream from where davis creek flows into lake powell a narutal ramp zigzags down from the canyons west rim
four anasazi pots were carefully arragned on a rock nearby
an extensive search shed no light on his whearabouts
also like mccandless ruess was undeterred by physical discomfort at times he seemed to welcome it

The author's tone is evident in the following sentence: "An extensive search shed no light on his whereabouts."

The author's tone is evident in the following sentence: "Also like McCandless, Ruess was undeterred by physical discomfort; at times, he seemed to welcome it."

To identify the author's tone in a sentence, we need to understand the overall attitude or emotion that the author is conveying. In the book "Into the Wild," the author's tone can often be determined by analyzing the choice of words, sentence structure, and context. Let's analyze the provided sentences to identify the author's tone in each:

1. "Just upstream from where Davis Creek flows into Lake Powell, a natural ramp zigzags down from the canyon's west rim."
Here, the sentence describes a natural setting, utilizing a neutral and descriptive tone without any apparent emotional or judgmental elements.

2. "Four Anasazi pots were carefully arranged on a rock nearby."
This sentence seems to convey a neutral tone, focusing on the observation of ancient artifacts without any discernible emotion.

3. "An extensive search shed no light on his whereabouts."
In this sentence, the author's tone appears to be one of concern or frustration. The use of words like "extensive search" and "shed no light" suggests that the author is expressing a sense of disappointment or helplessness about the lack of progress in finding someone.

4. "Also like McCandless, Ruess was undeterred by physical discomfort; at times, he seemed to welcome it."
Here, the author's tone seems to be admiring or appreciative. The usage of words like "undeterred" and "welcome" indicates that the author is showing approval or admiration for both McCandless and Ruess's ability to endure physical discomfort.

Based on the analysis, the author's tone is evident in the third sentence, "An extensive search shed no light on his whereabouts," where the tone is one of concern or frustration.