How were the pharaohs of Egypt able to build huge monuments and temples that took decades to complete?
They used slaves for workers and their wealth from plunder and trade.
They used slaves for workers and borrowed money from other rulers.
They used volunteers for the work and money from tribute and plunder.
They used volunteers for the work and borrowed money to buy materials.
"They used slaves for workers and their wealth from plunder and trade" would be the best option, since slavery during this time, especially when it came to construction, was very prominent.
