求助be combined with、be linked to与be associated with的区别

求助be combined with、be linked to与be associated with的区别例如：A study shows that eating more fruit and vegetables is_______to a lower risk of dying from heart disease.A.linked B.combined C.attached D.associated正确答案：A我当时做的时候首先排除掉了毫无关系的C项,接着根据be linked to的固定搭配选了A选项.可是现在回过头来想想,如果空格后面是with的话,那么可不可以选B或者C呢?老实说,不大明白这三个词组的区别,烦劳各位英语达人帮忙指点一下,不胜感激~