Answer:
A. Education
Step-by-step explanation:
Having an education allows a person to learn certain set of skills and knowledge around the world. This may act as a "buffer" or a barrier against unemployment because it gives the person a higher chance of getting employed. Many people know that possessing a certain degree gives you an edge to get interviewed and if possible, get hired. Continuous learning (education) makes you a well-rounded person capable of doing just any kind of job available out there.
So, this explains the answer.