Answer:
B) shifts in the economy that make certain job skills obsolete.
Step-by-step explanation:
There are three types of unemployment:
- Structural Unemployment (involuntary) : the skills of the worker do not match the skills required by employers.
- Cyclical Unemployment (involuntary): slow economic growth or economic contraction cause that employers require less workers.
- Frictional Unemployment (voluntary): someone quits his/her job voluntarily because they are searching for a better job, or new workers enter the labor force.