Concept:Indirect rule in Nigeria was introduced because the British lacked enough colonial officials to govern directly.
Explanation:The British colonial government could not recruit enough European officers to administer the large Nigerian territory.
Sending many British staff overseas was also too expensive and difficult.
Therefore, the British decided to rule through local traditional rulers and chiefs.
These chiefs helped the British enforce laws, collect taxes, and maintain order.
Although lack of financial resources was a challenge, the more direct cause among the options was the shortage of trained manpower.
Thus, the introduction of indirect rule was mainly due to insufficient British personnel.
Answer:B. Manpower and personnel shortages.