求助OG17第787题 关于V+ing修饰主语还是临近名词

杰弟弟

Beatrix Potter,in her book illustrations,carefully coordinating them with her narratives, capitalized on her keen observation and love of  the natural world.


A Beatrix Potter,in her book illustrations,carefully coordinating them with her narratives,
B in her book illustrations,carefully coordinating them with her narratives,Beatrix Potter
C in her book illustrations,which she carefully coordinating them with her narratives,Beatrix Potter

正确答案是C，在OG的解释里，b说该coordinating修饰的是 illustration。

我想请教一下在GMAT里，在V+ING前加逗号不是应该修饰主语，在v+ing前紧贴名词没有逗号就是修饰名词吗？为什么这里有逗号却说修饰前面的illustration呢？

还想请教一下为什么AB错的原因

杰弟弟

求各位指导