the labor-force participation rate of aridia . a. increased from 2010 to 2011 and increased from 2011 to 2012. b. decreased from 2010 to 2011 and decreased from 2011 to 2012. c. increased from 2010 to 2011 and decreased from 2011 to 2012. d. decreased from 2010 to 2011 and increased from 2011 to 2012.