OG12-95 一个小小的修饰问题

95. The peaks of a mountain range, acting like rocks in a streambed, produce ripples in the air flowing over them; the resulting flow pattern, with crests and troughs that remain stationary although the air that forms them is moving rapidly, are known as
“standing waves.”
(A) crests and troughs that remain stationary although the air that forms them is moving rapidly, are
(B) crests and troughs that remain stationary although they are formed by rapidly moving air, are
(C) crests and troughs that remain stationary although the air that forms them is moving rapidly, is
(D) stationary crests and troughs although the air that forms them is moving rapidly, are
(E) stationary crests and troughs although they are formed by rapidly moving air, is

答案C
不过我有个小问题，就是那个E前面的stationary crests and troughs中的stionary在这里会不会有修饰不清的嫌疑？到底是修饰crests还是修饰crests and troughs?
虽然与此题的大方向无关，但还是想请教一下大家自己实在是很容易将形容词或是名词与后面的修饰对象弄混
多谢啦~