8. One pervasive theory explains the introduction of breakfast cereals in the early 1900s 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.

(A) by persuading people to eat what had previously been horse feed, market equilibrium was restored

(B) persuading people to eat what had previously been horse feed restored market equilibrium

(C) by persuading people to eat what had previously been horse feed, it restored market equilibrium

(D) the persuasion of people to eat what had previously been horse feed restored market equilibrium（B）

(E) market equilibrium was restored when people were persuaded to eat former horse feed

请NN们看看这题是怎么一眼看就选B的？万分感谢！

a错在产生 market equilibrium persuads pleople to eat

c的it指代有问题。

d有些wording，动词表达很清楚。

e改变了persuade的状态，persuading表示一种连续性。

E可以是 when people were being peruaded，但这样又比较wordy

我当时就是选E的，再请教一下，为什么要加being呢？是不是那个former horse feed 有问题？