_____ by the killers whales, the whalers were able to make a successful kill.

A．To help out

B． Helped out

C．Helping

D．Being helped out

客户经理根据卷烟零售户的月进货量，合理制定各品牌、规格卷烟订货量的上下限，为卷烟零售户合理控制库存，做到不积压不脱销。