Concept:Unemployment that occurs during the time a worker spends moving from one job to another is known as frictional unemployment.Explanation:Workers who voluntarily leave their current jobs to look for better or more suitable jobs are temporarily unemployed.This period of job searching creates a natural gap in employment.Frictional unemployment is short-term and often reflects normal labour market movement.It is different from seasonal, structural, or cyclical unemployment because it is linked to job transition rather than economic conditions.Answer:C. frictional unemployment