请问一道新东方小蓝上的语法题

是小蓝上面part1 的20题：

An array of tax incentives has led to a boom in the construction of new office buildings;so abundant has capital been for commercial real estate that investors regularly scour the country for areas in which to build.

A.so abundant has capital been for commercial real estate that

B.capital has been so abundant for commercial real estate,so that.

答案是A,但是不太清楚B怎么错了。谢谢解答！

还有不知道哪里可以找到新东方蓝皮书（小蓝）的part1 的讲解呢？谢谢了！

B中 so abundant for commercial real estate,so that.

so...,so that...没有这种用法。

考点是so...that...