One Cause for Much Concern by Europeans and Colonial Authorities

One cause for much concern by Europeans and colonial authorities dealt with the:

A) tension between preserving national traditions and identity in the face of a constantly changing,hybrid colonial culture.
B) surprisingly successful creation of a well-disciplined work force and complete Europeanization of cities in western and southern Africa.
C) inability of the European countries to change the societies they had colonized; it proved very difficult to establish schools and financial institutions.
D) continued rejection of all contact with Europeans by the newly colonized peoples of Africa and Asia; Europeans failed in their effort to fully integrate with the native populations.
E) failure of people in the mother countries to allow any emigration by colonials to Europe and the continued suspicion of those who had served overseas.