GMAT Verbal Reasoning Practice Test 4

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Question : 72 of 100
 
Marks: +1, -0
Kale has more nutritional value than spinach. But since collard greens have more nutritional value than lettuce, it follows that kale has more nutritional value than lettuce.
Any of the following, if introduced into the argument as an additional premise, makes the argument above logically correct EXCEPT:
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