Frictional unemployment occurs when individuals are temporarily out of work while transitioning from one job to another or entering the workforce. Among the options provided, the one that most directly leads to frictional unemployment is:
opportunities for higher wage jobs in a new industry
This scenario often causes workers to leave their current positions in search of better-paying opportunities, leading to a period of unemployment as they seek new jobs.
The other options might lead to different forms of unemployment but are less specifically related to the concept of frictional unemployment.