between C and E , E is wrong because it doesn't convey intended meaning .
(C) crests and troughs that remain stationary
although the air that forms them is moving
rapidly, is
(E) stationary crests and troughs although they are
formed by rapidly moving air, is
in E contrast is not clear that crests and troughs remain stationary even if the air , which form them, moves rapidly.
(C) crests and troughs that remain stationary
although the air that forms them is moving
rapidly, is
(E) stationary crests and troughs although they are
formed by rapidly moving air, is
in E contrast is not clear that crests and troughs remain stationary even if the air , which form them, moves rapidly.
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