The best answer is, A.One of the largest in history, with an area occupied by more than 30 countries today.
The Roman Empire occupied vast territories, ruled over millions of people and fostered a diverse culture focused on architectural beauty and efficiency, continuous expansion, and provided luxury to wealthiest members of society. During the Roman Empire's height almost one-fourth of the entire world's population was under its rule, an enormous amount of people who practiced different religions, spoke different languages, but all who identified in some way as Roman.
