问题
                    
o the shops make money ifthey sell at such low prices —Manufacturers, it seems, arewilling to bring down prices _______ big volume purchases.
                            A:under the name of
B:on behalf of
C:in return for
D:in preparation for
                        
                        B:on behalf of
C:in return for
D:in preparation for
正确答案是:
                        