请教一个问题。

ub_serain

Although Napoleon’s army entered Russian with far more supplies than （they had in their previous campaigns）, it had provisions for only twenty-four days.
A.        they had in their previous campaigns
B.        their previous campaigns had had
C.        they had for any previous campaign
D.        in their previous campaigns
E.        for any previous campaign


答案是E. 可以告诉我为什么吗? 谢谢。

tongxun

"they had": the word "they" denoted the army. In some sense, it is correct. But in the last part of sentence, the author used "it" to denote army. Moreover, the comparison was focus on "supplies for campaign".