The correct answer is option 1, Benin. To understand why Benin is not land-locked, let`s look at each option:

Option 1: Benin - This country is situated in West Africa and has access to the Atlantic Ocean through its southern coastline. Therefore, it is not land-locked.

Option 2: Chad - Chad is a land-locked country located in Central Africa. It is surrounded by six other countries and does not have direct access to any coastline.

Option 3: Lesotho - Lesotho is a land-locked country in Southern Africa. It is completely surrounded by South Africa and does not have any coastline.

Option 4: Mali - Mali is a land-locked country in West Africa. It is surrounded by seven other countries and does not have direct access to any coastline.

Therefore, the only African country among the options that is not land-locked is Benin, making option 1 the correct answer.