Concept:Imperialism refers to the control or influence of one nation over another for economic and political gain.Explanation:European powers colonized African and other territories mainly to gain access to raw materials and new markets.These resources helped strengthen and expand their economies at home.At the same time, controlling more territories increased their political power and global influence.Thus, the primary goal was not to develop colonies, spread democracy, or end ethnic rivalry.Answer:B. expand its economy and political base