Concept:The power to amend Nigeria's constitution lies with the legislature.Explanation:A constitutional amendment in Nigeria must be passed by the National Assembly.The National Assembly is made up of the Senate and the House of Representatives.These two chambers must approve the amendment before it can take effect.The President, the Supreme Court, and INEC do not have the constitutional power to approve amendments.They may be involved in signing or interpreting laws, but they cannot approve constitutional changes.Answer:B. The National Assembly