Amgen and Genentech are competitors in the biotechnology market. In a recent year, Amgen reported a gross profit percentage of 87.2% while Genentech's percentage was 71.5%. What is the most likely cause of Amgen's higher gross profit percentage? Answer A. Lower product selling prices for Amgen. B. Lower product costs for Amgen. C. Genentech's inability to control selling and administrative expenses. D. Both B and C led to a higher gross profit percentage for Amgen. E. All of the above caused the higher percentage