In the empires, theaters, aqueducts, stadiums, roads and the like were all built by: A. Highly trained workers b.The middle class workers C. Hired foreigners d. Slaves
In this question, I guess the empires, theaters as well as the aqueducts, stadiums and roads were all built by d. slaves. I am not sure but hope this is the right answer and would be of big help then.
