In March 2016 American employers added 215,000 positions to their payrolls, bringing the average job increase for the year to more than 200,000 per month. At the same time, though, the official unemployment rate actually went up, from 4.9% to 5.0%. What is a likely explanation? Group of answer choices The labor force has decreased The number of volunteering positions in the U.S. economy has decreased The number of people working part-time has increased "Discouraged workers" re-entered the labor force