Which statement defines what the author of "Vacation and Presenteeism" means by "presenteeism"? Americans, on average, take enough vacation time, but it interferes with their productivity at work. Americans, on average, are absent from their jobs more than they are present, which makes them more productive at work. Americans, on average, are present at their jobs, but they are less productive because they don't work efficiently. Americans, on average, are absent from their jobs more than they are present, which makes them less productive at work.