Concept:Underemployment occurs when a qualified worker is employed in a job that does not fully use their skills or professional capacity.
Explanation:The electrical engineer already has a job as a physics teacher, so he is not unemployed.
However, his professional engineering training is not being fully utilized in the classroom.
He is working below his capacity because the teaching job does not match his level of specialized skill.
This situation is different from full employment, which means using one's qualifications completely.
It is also not technological unemployment, since no machines have displaced him from an engineering job.
Therefore, when a person is engaged in work far below their qualification level, such a worker is described as underemployed.
Answer:A. Under-employed