What Was the Purpose of the Imperialist Policy of Indirect

What was the purpose of the imperialist policy of indirect rule?

A) To force Africans to convert to Christianity.
B) To assimilate Africans into European thought and culture in order to "civilize" them.
C) To force African traditional rulers to send their children to Western-style schools.
D) To make use of traditional African rulers to assist in administering the colonies.
E) To administer the colony from the European capital of the home country.