Concept: Nigerian coalition politics before independence and its regional restructuring.Explanation:The NPC and NCNC formed a coalition government due to no single party winning an outright majority.This coalition supported the creation of a separate region for the minority groups in the Western area.Their combined parliamentary strength facilitated the passing of the law that established the Mid-West Region in 1963.Therefore, the NCNC and NPC were instrumental in bringing about the Mid-West Region.Answer: C. Mid-West Region