Answer:
D. employed
Explanation:
a. Structural unemployment is a type of unemployment which results from skill expectation gap, where the unemployed do not possess the skill required for a particular job. This does not apply to Dr. Homer Simpson
b. Frictional unemployment is the unemployment that results from the time a job seeker leaves one job and the time he gets another one. This does not apply to Dr. Homer Simpson
Dr. Homer Simpson is in labor force as he is presently running a commercial fishing boat in Alaska to earn extra income.