Which did not prompt european imperialism in the late nineteenth century? -promises of prosperity -need for raw materials -discovery of gold in africa -zeal for missionary work

The correct sentense is "-Discovery of gold in Africa "

The term New Imperialism (also Neoimperialism) refers to the policy and ideology of colonial expansion and imperialism adopted by the European powers and later by the United States and Japan from the late nineteenth century to the early twentieth century, approximately since the Franco-War. Prussian (1871) until the beginning of the First World War (1914). The qualifier "new" is to contrast it with the first wave of European colonization from the fifteenth to the nineteenth centuries and with imperialism in general. It is characterized by an unprecedented persecution of what has been called "the empire for the empire itself", an aggressive competition for the acquisition of overseas territories accompanied by the emergence in colonizing countries of doctrines of racial superiority that denied the ability of the peoples subjugated to govern themselves.

This was what was reflected during the 19th century in the African continent.

bless you your highness

i think it was   tsar alexander ii