想问问楼主,里面有一道题目是
尽管A of B的结构,which没有就近修饰
561. One pervasive theory explains the introduction of breakfast cereals in the early1900s as a result of the growing number of automobiles, which led to a decline in horse ownership and a subsequent grain glut; by persuading people to eat what had previously been horse feed, market equilibrium was restored
which指代的应该是什么,怎么解释呢?