GMAT Sentence Correction
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Source: Manhattan
Level: 3
A powder derived from the North American Echinacea flower, which has been effective in preventing colds, is grown by many small farmers out West.
- A A powder derived from the North American Echinacea flower, which has been effective in preventing colds,
- B A derivative, which has been effective in preventing colds, of North American Echinea flower,
- C North American Echinacea flower derivative, which has been effective in preventing colds
- D The North American Echinacea flower has a derivative which has been effective in preventing colds, that
- E The North American Echinacea flower, a derivative of which has been effective in preventing colds,