【正确答案】 A

【答案解析】第四段中举例讲工业生产经理与procurement部门负责人合作时，对这一部门的工作做了补充说明“the production manager works with…maintained at their optimal level．”，并且后文还说“…between the production manager and the purchasing department…”，直接说明procurement department就是purchasing department，所以选A。