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
You should let your emotions out. Don't hold them in that only makes it worse... Losing someone you love is very hard and i'm glad you're still here... You should try to vent to someone you trust so you can let everything out. I hope you're okay and i hope you know you're loved.
A for sure, because it's listing what it's talking about. If that makes any sense, heh :) I hope that's correct on your test!
