The answer is d. France. The French invaded in Mossi states after
taking over the surrounding territories.
This led to the French control of the region. The last king Wobgo
retired and was awarded a pension by the British. He died in 1904.
War and violence. While epidemic disease was by far the leading cause of the population decline of the American indigenous peoples after 1492, there were other contributing factors, all of them related to European contact and colonization. One of these factors was warfare.
With a form of democratic government