Which of the following is a case of frictional unemployment?

A.
Timothy is looking for a job where he can apply his expertise in computer programming.

B.
Thomas recently quit his job to start his own business.

C.
Terrance, who has a certificate in TV/VCR repair, cannot find a TV/VCR repair shop in his town to apply to for a job.

D.
Tina was laid off temporarily during a period of low demand for her company's product. Tine is using the time off to volunteer at her church.