Concept:Agriculture, especially farming, employs the largest share of the working population in West African countries.
Explanation:The majority of West Africans live in rural areas and depend on the land for their livelihood.
Farming includes the cultivation of crops and the rearing of livestock, which provides both food and income for most households.
While fishing and mining are significant in coastal or mineral-rich zones, their reach is limited compared with farming.
Teaching is a smaller formal-sector occupation and is not predominant in these economies.
Therefore, the most common occupation across the region is farming.
Answer:A. farming