og207 请教如何翻译

In the textbook publishing business, the second quarter is historically weak, because revenues are low and marketing expenses are high as companies prepare for the coming school year.

(A)  low and marketing expenses are high as companies prepare

(B)   low and their marketing expenses are high as they prepare

(C)  low with higher marketing expenses in preparation

(D)  low, while marketing expenses are higher to prepare

(E)   low, while their marketing expenses are higher in preparation

答案是A。题做对倒是没问题，可是不知道句子的正确意思。哪位帮忙给翻译

一下？谢谢！