A. Students who read in silence scored better than those who read with background noise.
I think the correct answer to this question is "metaphor." The statement is a metaphor because it describes the canal as an enterprise of breathtaking boldness. A metaphor is when you liken something to another thing without using the word "like." Thank you for posting your question. I hope that this answer helped you. Let me know if you need more help.
Answer: The adverb slowly describes the verb walked. It basically says HOW the person walks (like did they walk fast, slow, at an average pace, etc., and in this case, it says that they walked in a slow manner).
Edit: so I’m assuming effect is like the mood of the story created, and I’d say that it creates a somber, suspenseful feeling, opposed to if she was walking quickly, which would create a rushed mood.