Answer:
A. They increase the opportunity cost of job search
Explanation:
Unemployment is when a person able & willing to do a job fails to get a job. Opportunity Cost is the cost of next best alternative foregone while choosing an alternative.
Opportunity Cost of job is the : free leisure time & unemployment insurance payment - sacrifised while doing a job. Increase in unemployment insurance payment increases the opportunity cost of job search. This is likely to increase the unemployment rate , as mentioned in the question statement.