The correct answer is A) it relied mainly on the coffee trade.
The statement that is true about the kingdom of Oromo is that it relied mainly on the coffee trade.
Oromo people represent one-third of the actual population in Ethiopia. The Kingdom of Oromo in the 16th century was a pastoral people dedicated to agriculture. They had livestock and they constantly looking for grazing. Instead of kings, they had leaders that people chose. In those years, two nations emerged, the Sadaga and the Afre. They grew coffee and traded it with other nations.