The main industrial cities in Nigeria are

Step 1: Analyze the question The question asks which group of cities is made up of Nigeria's main industrial centres. These are cities with a high concentration of factories, manufacturing firms, and processing industries.

Step 2: Concept Industrial cities in Nigeria developed where there are:

• Large markets (high population)
• Good transport links (ports, rail, roads)
• Power supply and a supply of labour
• Raw materials nearby

Step 3: Evaluate the options

• A. Ikeja, Kano, Onitsha and Port-Harcourt: Ikeja is the industrial heart of Lagos, with many manufacturing estates. Kano is the leading industrial centre in the North, with textiles, leather and food processing. Onitsha is a major commercial and industrial centre in the South-East. Port-Harcourt has oil refining, petrochemicals and many manufacturing firms. All four are well-known industrial cities.
• B. Kaduna, Dutse, Ogbomoso, Calabar: Kaduna and Calabar are industrial to a degree, but Dutse and Ogbomoso are not major industrial centres.
• C. Kano, Ilesa, Vadeikya, Afikpo: Only Kano is a major industrial city. Vadeikya is a small town.
• D. Maiduguri, Ikote Ekiti, Moniya, Akungba: These are mostly small towns or institutional or agricultural centres.
• E. Mokwa, Ijebu-ode, Warri, Gummel: Mostly small or minor centres, with only Warri having some industry.

Step 4: Answer

Correct answer: A

Exam tip: In questions like this, look for the option that has the most well-known cities. Names like Lagos/Ikeja, Kano, Port-Harcourt, Kaduna, Aba, and Onitsha almost always point to the correct option in industrial location questions. Eliminate options with small or unfamiliar towns.