Answer:
Religious pilgrims and church business, is the right answer.
Step-by-step explanation:
The Roman Empire developed its position early on by attempting to dominate the Mediterranean. The control of the Mediterranean provided Rome with expanding military and economic dominance. The naval strength of the empire helped its spread by adequately defending its opponents and implementing the required protection to secure the economy flourished. However, the income of Rome was mostly provided by religious pilgrims and church business.