GWD-9-Q2 关于现在分词

GWD-9-Q2:

In an attempt to produce premium oysters, a firm in Scotland has developed a prototype of a submersible oyster farm, sitting below the surface of the ocean, and it provides ideal conditions for the mollusks’ growth.

1. farm, sitting below the surface of the ocean, and it provides

2. farm, sitting below the surface of the ocean for providing

3. farm that sits below the surface of the ocean and providing

4. farm that sits below the surface of the ocean and provides
5. farm that is sitting below the surface of the ocean and it provides

选D没有问题

如果B中改成and providing能不能选呢？

现在分词作结果状语，逻辑主语是什么，sitting below the surface of the ocean and providing ideal conditions for the mollusks’

growth解释前面整句我觉得没问题，但如果逻辑主语是firm就说不通了

困惑啊！

盼望大家讨论，谢谢

这里有个相关的讨论：http://forum.chasedream.com/dispbbs.asp?boardID=23&ID=63224&page=1

从那里的讨论看来，后面的伴随状语是可以就近修饰的。但是当伴随状语在句首时，这个状语的动作者必定是主句的主语，是否在句尾就不一样了呢？希望有更多讨论。

我觉得B选项改过之后也不如D选项好，因为容易造成困惑，逻辑主语既可以是firm,也可以是farm。

that修饰更精确。