Respuesta :
The answer is C. Structural because Unemployment arising from a persistent mismatch between the skills and attributes of workers and the requirements of jobs.
The correct answer would be alternative B)"Frictional."
Frictional Unemployment is the kind of unemployment in which people are in the process of moving from one job to another.
The example given in the question is a clear demonstration of it, since Joe isn't happy in his job and is switching to a new one, because he can't stand it anymore.