In Africa, the climate is generally divided into deux (two) main seasons: the dry season (la saison sèche) and the rainy season (la saison des pluies). This is the standard geographical and climatic classification for tropical and sub-Saharan Africa, which is the context typically tested in JAMB French.
This contrasts with Europe, which has four seasons (le printemps, l'été, l'automne, l'hiver). The option quatre (four) therefore applies to the European climate, not the African one. The options dix (ten) and cinq (five) do not correspond to any standard seasonal classification.
This is a common cultural knowledge question in French for West African examinations: Africa has two seasons, Europe has four.
