Answer:
I can't write your essay for you but I use prepostseo.com which is an article rewriter that makes sure it doesn't plagiarize. You basically copy an article and paste it in.
Explanation:
Hi! The sentence you gave is a complex sentence. For a sentence to be compound, it should contain multiple subjects or predicate. On the other hand, for it to be complex, a subordinate clause must be present.
We can notice that the clause "that were built under the city" is a clause that cannot stand alone thus this will tell us that the sentence is complex.
ANSWER: D. Complex
I would say either problem/solution or cause/effect
The correct answer would be c
