Which one of the following African countries does not border with the Mediterranean Sea ?

Algeria
Chad
Morocco
Tunisia

The correct answer is (b), Chad. Chad is a landlocked country in north-central Africa. It is bordered by Libya to the north, Sudan to the east, the Central African Republic to the south, Cameroon and Nigeria to the southwest, and Niger to the west.

Algeria, Morocco, and Tunisia are all North African countries that border the Mediterranean Sea.