Question

what was the primary basis of aksums wealth?
they conquered egypt and assimilated all of egypts wealth
they controlled extensive trade routes that connected many cultures
they exported thousands of slaves to europe
they discovered rich gold deposits within the boundaries of the kingdom

Explanation:

The Aksumite kingdom's wealth was primarily based on controlling extensive trade routes (like the Red Sea trade) that connected various cultures, facilitating trade of goods like ivory, gold, and spices. Conquering Egypt isn't accurate for Aksum's wealth source, slave export to Europe wasn't a primary basis, and gold deposits discovery wasn't the main wealth driver.

Answer:

the option "they controlled extensive trade routes that connected many cultures" (the third option from the top)