og 105 much的用法？

105. An inventory equal to 90 days sales is as much as even the strongest businesses carry, and then only as a way to anticipate higher prices or ensure against shortages.

(A)  as much as even

(B)   so much as even

(C)  even so much as

(D)  even as much that

(E)   even so much that

不明白这里的as much as 修饰的是什么，much应该修饰不可数名词，或者作为程度副词，那这里是什么意思？是不是可以从句子的意思来解释，可是这句话的主语究竟是什么呢？