In 1979 the number of high school dropouts in a country was 5216 thousand By 2007 this number had decreased to 3120 thousand Find and interpret the average rate of change per year in the number of high school dropouts CIE Select the correct choice below and fill in the answer boxes to complete your choice Round to the nearest tenth as needed OA The average rate of change is about decreased by an average of about OB The average rate of change is about decreased by an average of about OC The average rate of change is about thousand each year The number of high school dropouts thousand each year from 1979 to 2007 thousand each year The number of high school dropouts thousand in the year 2007 thousand each year The number of high school dropouts increased by an average of about thousand in the year 2007 OD The average rate of change is about thousand each year The number of high school dropouts increased by an average of about thousand each year from 1979 to 2007