The correct option is A disguised unemployment
A situation in which available work tasks are split among resources
(typically labour) such that they seem fully employed but in reality
much of their time is spent in unproductive activities is called
disguised unemployment. Here the marginal productivity of labour comes
to zero. When aggregate demand for goods and services in the economy
falls far below its capacity, a large chunk of labour force gets
employed. This is known as cyclical unemployment. While structural
unemployment means the change in the demand pattern for goods
necessitates change in the demand pattern for labour. But labour force
cannot immediately metamorphose, matching the change in demand pattern.
Due to these conditions a state of unemployment occurs that is known as
structural unemployment.