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
        
             
        
        
        
Answer:
The young soldier was ordered to be brought before the king.
Explanation:
In passive sentences, the subject undergoes the action of the verb.
 
        
                    
             
        
        
        
i believe it is B. Better
 
        
                    
             
        
        
        
Answer: Nor
When to use neither and nor in a sentence?
A “nor” usually follows a “neither” when they're used in the same sentence (1). For example, you might say: I like neither hot dogs nor ketchup. You can also use “nor” if you're talking about more than two items, but you have to repeat “nor” after each element 
 
        
                    
             
        
        
        
Comments that the sky looks blue