The correct answer is C. The all-powerful ruler of Benin was known as the oba.
Currently Benin is a country on the west African coast. Approximately 25% of its population is Muslim, but Islam never became the dominant or majority religion.
The Kingdom of Benin developed between the 12th and 18th centuries was based in its capital city also called Benin and and controlled a surface that was changing over time but that approximately agrees with the territory of the present Benin. The African savannah was limited to it towards the north.
The leader who controlled the kingdom was called oba. He had absolute powers and was considered king and god. His palace was located within the capital city and is said to be a city within the city.
The power of the oba was based on the commercial relations that it knew how to maintain with the European merchants, whose businesses represented the main source of income towards the kingdom. The succession of the throne was by hereditary way and the old tribal chiefs had an important rank that maintained them faithful to the regime.
At the beginning they exported pepper and secondly ivory, but in its heyday it was characterized as one of the most important ports where slaves were sold to be brought to the American continent by the Portuguese, especially Brazil.