The question asks which of the given names is a French city. The correct answer is Lyon, the third-largest city in France, located at the confluence of the Rhône and Saône rivers in southeastern France. Lyon is a major cultural and economic centre and the capital of the Auvergne-Rhône-Alpes region.
The other options are all cities in francophone West Africa, not in France:
Abidjan is the economic capital of Côte d'Ivoire (Ivory Coast).
Cotonou is the largest city and economic centre of Benin.
Lomé is the capital of Togo.
While all four cities are French-speaking, only Lyon is located in France itself. For the JAMB French examination, it is important to distinguish between cities in France (such as Paris, Lyon, Marseille, Toulouse, Nice) and cities in francophone African countries.