Frictional unemployment occurs when:.1. there is friction between an employer and employee. 2. a worker decides to quit one job to seek a different job. 3. a large corporation transfers a worker to another city. 4. college students go back to school at the end of the summer.

2. a worker decides to quit one job to seek a different job.

Explanation:

Frictional unemployment occurs when workers are moving from one job to another. It happens when the available jobs and the workers' skills do not match. For example, a graduate from the university cannot find a job that matches the skills straight away. The period of searching for that first job is called frictional unemployment.

Frictional unemployment is naturally occurring in the economy.  It is present when the economy is in full employment.  It is present as workers are always searching for better opportunities elsewhere, and students are graduating and searching for their first employment.

answer; by looking at total product,marginal product,and changes in both after changes in inputs

the correct answer is:     [c]:     " cyclical unemployment " .