Answer: c. increase structural.
Step-by-step explanation:
Structural unemployment refers to the mismatch between the skills and qualifications of job seekers and the requirements of available job openings. When the job search process is lengthened, it indicates a higher level of difficulty in finding suitable employment due to underlying structural issues in the economy. This can include factors such as technological advancements, changes in industry demands, or shifts in the labor market. Therefore, a lengthened job search process contributes to an increase in structural unemployment.