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(A) A powder derived from the North American Echinacea flower, which has been effective in preventing colds,is grown (A powder cannot be grown. Rather it is derived from flower)
(B) A derivative, which has been effective in preventing colds, of the North American Echinacea flower, is grown (Same as A)
(C) A North American Echinacea flower derivative, which has been effective in preventing colds is grown (Same as A)
(D) The North American Echinacea flower has a derivative which has been effective in preventing colds, that is grown (Comma before that is wrong)
(E) The North American Echinacea flower, a derivative of which has been effective in preventing colds, is grown (Correct)

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1. 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 the North American Echinacea flower
(C) A 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, is grown

SV pair correct.

Hence E.
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The key word here is "is grown". "a derivative powder prevents cold" still makes sense.
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vishalkumar4mba
1. 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 the North American Echinacea flower
(C) A 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,

This question is a easy one , but I have a silly confusion on aswer choice E.

"Of which " refers to Echinacea flower so Can I ignore this as of which is not close to the noun it modifies ???

What is a scope of the rule "Close of noun " for noun modifiers.

Thanks




Look at the last part "is grown by many farmers out West". So the subject has to be "The North American Echinacea flower". This eliminates A, B and C. D doesn't follow a logical pattern as that cannot be used like this. So E
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By subject verb make sense rule.
E is the best option among rest.

Sent from my SM-N9007 using GMAT Club Forum mobile app
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vishalkumar4mba
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 the North American Echinacea flower

(C) A 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,


This question is a easy one , but I have a silly confusion on aswer choice E.

"Of which " refers to Echinacea flower so Can I ignore this as of which is not close to the noun it modifies ???

What is a scope of the rule "Close of noun " for noun modifiers.

Thanks

MANHATTAN REVIEW OFFICIAL EXPLANATION:



To answer this question, you first have to realize that the basic structure of this sentence is fairly simple. The main verb of the sentence is “grown”. What is grown? A flower is grown, not its derivative. Choices A, B, C and D all imply that it is a derivative or a powder which is grown out West and not the flower. This is a clear flaw in logic. The only answer choice that has the correct subject is Choice E.
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