Concept:British colonial tolerance for political parties and interest groups allowed nationalist movements to grow and accelerate.
Explanation:In the British West African Colonies, the government permitted political participation and the formation of political parties.
This created a legal and open space for nationalists to organize, mobilize support, and demand independence.
As a result, the pace of independence movements increased steadily.
The essential factor was therefore the tolerance shown toward political parties and demonstrations.
Answer:C. tolerance for political participation and demonstration through political parties