GMAT Sentence Correction
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Source: OG
Level: 4
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