Nigeria's diplomatic representative in British is known as

Nigeria's diplomatic representative in Britain is known as the High Commissioner. A High Commissioner is the equivalent of an Ambassador in countries that are part of the Commonwealth of Nations, such as Nigeria and Britain. The role of a High Commissioner is to represent their country's interests in the host country, foster good relations between the two countries, and engage in diplomatic negotiations on behalf of their government. The title "High Commissioner" is used instead of "Ambassador" in Commonwealth countries because of the shared history and cultural ties between these nations. While the term "Ambassador" implies a more distant and formal relationship, the term "High Commissioner" signifies a closer and more cordial relationship. Therefore, the correct answer is A, High Commissioner.