Concept:The kola species that are commercially cultivated in West Africa.
Explanation:Kola nut is an important cash crop in West Africa.
Not every kola species is grown for commercial purposes.
Cola nitida is the most widely cultivated commercial species.
It is commonly known as the kola nut and is native to tropical rainforests.
Cola acuminata is another commercially grown species.
Both species produce caffeine-rich nuts used in drinks and traditional medicine.
Cola verticillata and
Cola gigantea are not primarily grown for trade.
Therefore, only
Cola nitida and
Cola acuminata are the main commercial kola species.
Answer:Option C:
Cola nitida and
Cola acuminata.