关于comparison中as的用法的困惑？

slave918

107.        While it costs about the same to run nuclear plants as other types of power plants, it is the fixed costs that stem from building nuclear plants that makes it more expensive for them to generate electricity. A.        While it costs about the same to run nuclear plants as other types of power plants, it is the fixed costs that stem from building nuclear plants that makes it more expensive for them to generate electricity. B.        While the cost of running nuclear plants is about the same as for other types of power plants, the fixed costs that stem from building nuclear plants make the electricity they generate more expensive. C.        Even though it costs about the same to run nuclear plants as for other types of power plants, it is the fixed costs that stem from building nuclear plants that makes the electricity they generate more expensive. D.        It costs about the same to run nuclear plants as for other types of power plants, whereas the electricity they generate is more expensive, stemming from the fixed costs of building nuclear plants. E.        The cost of running nuclear plants is about the same as other types of power plants, but the electricity they generate is made more expensive because of the fixed costs stemming from building nuclear plants.

OA is B.看了好多讨论这道题的帖子，但是好像都没有回答我的疑惑。
那就是关于AS在这里的用法，我们知道AS如果要比较的话，必须是一个句子，包含一个动词。或者用as....as的结构。
关于这一点我参见的是Manhattan VERBS&COMPARSIONS Extra.
我知道为什么选B，但是我不明白的就是这里的AS，后面既没有VERB，也不是AS。。。AS结构。怎么表比较？？
这是我的困惑，求解？

slave918

求xdjm帮帮忙

slave918

难道是我的思路错了吗