Final answer:
Option (A), Frictional unemployment occurs when workers voluntarily leave their jobs, seeking better-suited positions, and also because of a mismatch of skills in the labor market, reflecting the time necessary for workers to find new opportunities.
Step-by-step explanation:
Frictional unemployment can result when workers voluntarily leave their jobs and when there is a mismatch of skills in the labor market. When workers leave their positions, there's a period of time before they find new employment that's suitable for their skills and needs. This unemployment period is a natural and expected part of a dynamic economy, where there are job vacancies and active job seekers.
Frictional unemployment does not arise due to employers offering competitive salaries or when workers are laid off due to economic downturns. Instead, it is a reflection of the time and effort needed for workers to move to new jobs that better fit their expertise or preferences, including the time to learn about job openings, apply, interview, and perhaps relocate. Job seekers and employers are both involved in this transition as they search for the right employment match.