The most accurate response regarding the correlation between Roman expansion policy and trade in the Indian Ocean is:
As the Romans conquered territory, they gained access to trade resources, which encouraged more expansion.
This statement captures the essence of how Roman expansion was often driven by the desire to secure trade routes and resources. The Romans recognized the strategic importance of the Indian Ocean for trade with regions such as India and beyond, leading them to expand their influence and control over trade networks. This expansion ultimately allowed them to access valuable goods and commodities, thus reinforcing the connection between their military conquests and economic interests.