Concept:The 1948 riots broke out in February 1948 because of economic hardship and anger against colonial rule.Solution:Causes of the 1948 riots included rising prices of imported goods, mass unemployment (especially of ex-servicemen returning from the Second World War), and general discontent against European rule. The shooting of ex-servicemen at the Christiansborg crossroads on 28 February 1948 set off the riots.Nkrumah's quarrel with and removal from the U.G.C.C. happened in 1949, after the riots, so it could not have caused them.Answer:Option A (Nkrumah's suspension from the U.G.C.C)