The most accurate response is: Each one depended upon the other for trade items.
This reflects the mutual interdependence that developed through trade between Kush and Egypt. Both regions benefited from the exchange of goods, resources, and commodities, leading to a relationship where they relied on each other for various trade items. For instance, Kush provided valuable resources such as gold, incense, and exotic animals, while Egypt offered products like grain, textiles, and manufactured goods. This symbiotic relationship fostered economic and cultural ties between the two civilizations.