All the following are problems identified with agriculture in West Africa except

The option "provision of food for the teeming population" is not a problem identified with agriculture in West Africa. It is a challenge, but not a problem in the sense that it is not necessarily a failure or a flaw in the agricultural system. Rather, it is a demand that the agricultural sector must meet. The other options listed, such as the land tenure system, ignorance of the farmers, and the use of crude implements, are problems in that they limit the ability of the agricultural sector to meet the demand for food. The land tenure system, for example, may not provide clear ownership rights to farmers, making it difficult for them to access credit or make long-term investments in their land. Ignorance of farmers may limit their ability to make use of modern techniques or technologies that could improve yields. The use of crude implements may limit the efficiency and productivity of farming operations. These are all problems in the agricultural sector that need to be addressed to improve food production in West Africa.