6. Adolphson Corporation has provided the following summary of its quality cost report for the last two years: Summary of Quality Cost Report (in thousands) This Year Last Year % Change Prevention costs .......................... $ 300 $ 200 +50 Appraisal costs ........................... 315 210 +50 Internal failure costs ................... 114 190 -40 External failure costs .................. 621 1,200 -48 Total quality costs ...................... $1,350 $1,800 -25 On the basis of this report, which one of the following statements is most likely correct? A) An increase in prevention and appraisal costs resulted in fewer defects, and therefore, resulted in a decrease in internal and external failure costs. B) A decrease in internal and external failure costs resulted in less need for prevention and appraisal costs. C) Quality costs such as scrap and rework decreased by 48%. D) Quality costs such as returns and repairs under warranty decreased by 40%.