Concept:Utilization of human resources means putting the available workforce to productive use in the economy.
Explanation:In West Africa, many people are willing and able to work, but there are not enough jobs for them.
This makes unemployment the biggest obstacle to making full use of the region's human resources.
When a large number of educated and uneducated people cannot find work, their skills remain untapped.
Housing, soil fertility, and emigration are not the direct problems that stop people from being utilized as workers.
Therefore, unemployment prevents the productive engagement of the labour force in West Africa.
Answer:A. unemployment