Concept:The 1948 riots increased anti-colonial feelings and pushed nationalists toward more active demands for self-government.Explanation:The killing of the three ex-servicemen at Osu Christianborg Castle Crossroads angered many Ghanaians.This event exposed the harshness of colonial rule and united nationalists in protest.It led to stronger opposition and greater pressure on the colonial administration.Answer:B. strengthened agitation against colonial administration.