Last summer one out of every five teenagers who sought employment failed to find it. This is hard to understand, since during this same time employers were searching for teenagers to fill an abundance of summer jobs. Many employers had been offering good pay and, in some cases, medical benefits. Which of the following, if true, most helps to explain why teen-age unemployment was high when there were many job openings? ['Many summer jobs offer training that will help the teen-ager secure a full-time position after graduation.', 'During the summer, some teenagers continue to work at jobs that they have held during the school year.', 'Many state programs that have been developed to help teen-agers find summer employment have recently had their budgets increased.', 'Most summer jobs are located in suburban areas that are inaccessible to the high proportion of teen-agers who live in cities.']