This is a compound sentence because you can break it into two sentences.
Hope this helps
Answer:
I believe the answer is numerical data, or B.
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Explanation:
•Historical legend is not a reliable source if you are looking for facts, as it is legend and hasn't been proven yet.
•Popular opinion would not be accurate either, as it is "opinion".
•Storytelling is not factual evidence, so that isn't an option either.
The correct answer among all the other choices is A. The city. This is what the boy who became an apprentice engineer always talk about when he was in town according to the reading. Thank you for posting your question. I hope this answer helped you. Let me know if you need more help.