Concept:The 1948 riots (after the shooting of ex-servicemen at the Christiansborg crossroads on 28 February 1948 and the boycott of European goods) shocked the colonial government and stirred up nationalism.Solution:After the riots many ordinary people became aware of colonial injustice and joined the struggle for self-government. This increased political awareness was a positive effect.The Big Six were arrested, not released, because of the riots (A). The riots led to the Watson and Coussey Commissions and so to the 1951 constitution; they did not replace it (C). The arrest of Dr. Kwame Nkrumah (D) was not a positive effect.Answer:Option B (Increased political awareness among the people)