Concept:Historical colonial ties shaped the main trade routes of Anglophone West African countries.Explanation:Anglophone West African nations, including Nigeria and Ghana, were former British colonies.These countries kept strong economic and trading links with Britain after independence.Their main exports and imports have traditionally been exchanged most with the United Kingdom.France is mainly linked to Francophone West African countries, not the Anglophone ones.Thus, the United Kingdom is the most important trading partner.Answer:D. United Kingdom