In which of the following sentences from Into the Wild is the author's tone evident?
A. Four Anasazi pots were carefully arranged on a rock nearby.
B. Just upstream from where Davis Creek flows into Lake Powell, a
natural ramp zigzags down from the canyon's west rim.
C. Also like McCandless, Ruess was undeterred by physical
discomfort; at times he seemed to welcome it.
D. An extensive search shed no light on his whereabouts.