What is the best summary of the U.S. unemployment rate? a.) It is the percentage of people in the U.S. who are of working age and are either unemployed O or underemployed. b.) It is the percentage of people in the U.S. who are of working age and are trying to find jobs. but do not have one c) It is the percentage of the total U.S. population who has not earned income in the last four O weeks () it is the percentage of the total U.S. adult population who do not have jobs