— How do the shops make money if  they sell at such low prices?  

— Manufacturers, it seems, are willing to bring down prices  ____ big volume purchases.   [ ]

A. under the name of            

B. on behalf of  

C. in return for                  

D. in preparation for

降脂药物中他汀类不能和贝特类联用，因为会明显增加肌病的发生率。（）