Final answer:
The most populous city in Africa is Lagos, Nigeria, which has exceeded other cities in population due to its business growth and economic opportunities.
Step-by-step explanation:
The most populous city in Africa is Lagos, Nigeria. With its expanding business operations and integration into the global economy, Lagos has surpassed other major African cities in terms of population, including Cairo, Egypt, and Addis Ababa, Ethiopia. As an important economic and corporate center, Lagos continues to attract individuals seeking employment opportunities, contributing to its rapid population growth. This growth is part of a larger trend of urbanization in Africa, with cities becoming focal points for development, as seen with other large cities like Nairobi and Johannesburg. Despite Africa's overall urbanization rate being only about 40 percent, Lagos stands out as a megacity with a population even larger than New York City and Chicago combined.