Under high pressure and intense heat, graphite, the most stable form of pure carbon, changes into the substance commonly referred to as diamond and remaining this way whether or not the heat and pressure are removed.
D项although改变了原文意思，原文是不管heat and pressure是否移开。但although似乎在陈述一个事实仿佛heat and pressure一定会被移开。因此改变了原文的意思。
E项中的thus可以代替 this way, like that, as such, in this way. 在题中应该代替this way。
