Yes they do to clearly understand the story
The answer is B because it doesn't have any commas and it wouldn't make sense without it. Looks like you got it correct.
<span>Muir's use of diction creates a mood of urgency and fear. The highlighted words - difficult, difficult, force, crooked, struggling, tangled, fallen, fear, faint and hungry - come together to make you feel that the author is in danger. The imagery is clear so that it comes alive in your mind. Diction can help create a mood which can help bring everything else together.
Hope this helps.</span>
