求解关于独立主格的问题，PREP-155

With surface temperatures estimated at minus 230 degrees Fahrenheit, Jupiter's moon Europa has long been considered far too cold to support life, and with 60 square miles of water thought to be frozen from top to bottom.

A. Europa has long been considered far too cold to support life, and with

B. Europa has long been considered far too cold to support life, its

C. Europa has long been considered as far too cold to support life and has

D. Europa, long considered as far too cold to support life, and its

E. Europa, long considered to be far too cold to support life, and to have

答案是B，我在做的时候迷糊了，总感觉（Jupiter's moon Europa has long been considered far too cold to support life ）和（its 60 square miles of water thought to be frozen from top to bottom）之间是不是应该加个and?? and its这样呢？

不是说逗号不能直接连接两个分局吗？
后来看了解释知道Its 后面是独立主格，但是这里是怎么判断独立主格和2个分局呢？如果加and对吗？

求NN，斑竹解答一下~