15. The foundation of Aksum's wealth was based on O A. trade. OB. conquest. O C. tribute. D. free markets.

Break Down the Problem

1. Identify the key elements of Aksum's wealth.
2. Assess the options provided to determine the correct answer.

Relevant Concepts

• Historical context of Aksum.
• Economic systems in ancient civilizations.

Analysis and Detail

1. Aksum was a powerful kingdom in ancient Ethiopia known for its trade networks, particularly in gold, ivory, and other commodities.
2. While Aksum did engage in conquest to expand its territory, the main driver of its wealth was its strategic position along trade routes connecting the Roman Empire and India.
3. Tribute might have played a role, but it was primarily the trade that established Aksum's prominence and prosperity.

Verify and Summarize

Based on historical evidence, Aksum's wealth was predominantly driven by trade, making it a central aspect of its economy.

Final Answer

The correct answer is A. trade.