An example of structural unemployment is a(n):________.
a. worker at a fast food restaurant who quits work and attends college
b. real estate agent who leaves a job in Texas and searches for a similar, higher paying job in Cali
c. autoworker who is temporarily laid off from an automobile company because of a decline in sales
d. geologist who is permanently laid off from an oil company because of an increase in wages won by labor unions