Which of the following countries are members of the lake Chad Basin Commission?

The countries that are members of the Lake Chad Basin Commission are Niger and Cameroun. The Lake Chad Basin Commission is an intergovernmental organization that was established in 1964 to promote cooperation and sustainable development in the Lake Chad Basin region. The organization includes four member countries: Chad, Niger, Nigeria, and Cameroun. However, only two of the given options include Niger and Cameroun together: Niger and Cameroun, and Chad and Benin. Since Chad is also a member country of the Commission, can be eliminated. Therefore, the correct answer is Niger and Cameroun.