Concept:The commercial centre is the settlement with the largest built-up area and most market functions shown on the map.Explanation:On the map, NONSO appears as the most developed and centrally located settlement.It has the greatest concentration of buildings and commercial activities.Adaku, Bukola, and Balu are smaller settlements with fewer market functions.Therefore, NONSO serves as the main commercial centre of the mapped area.Answer:A. NONSO
