哪个牛牛知道这个语法知识点

Q41:

Retailers reported moderate gains in their November sales, as much
because of their sales of a year earlier being so bad
as that
            shoppers were getting a head start on buying their holiday gifts.

1. of their sales of a year earlier being so bad as that
2. of their sales a year earlier having been as bad as because
3. of their sales a year earlier being as bad as because
4. their sales a year earlier had been so bad as because
5. their sales of a year earlier were as bad as that 
   

答案是不是D啊？

如果是，就是平行

nnnn得搞得不敢说话

逗号后得句子解释原因 as much  A  as   B 连接两个原因,   A句中有一个 so  bad比较混淆