题目信息
By the same techniques used for genetically enhancing plants, making them disease- or pest-resistant, researchers have been able to increase the amount of protein in potatoes, sweet potatoes, and tobacco.
A:By the same techniques used for genetically enhancing plants, making them
B:With the same techniques to genetically enhance plants, so that they are
C:Employing the same techniques used to genetically enhance plants so that they are
D:Employing the same techniques to genetically enhance plants, which makes them
E:Employing the same techniques for genetically enhancing plants that make them
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正确答案：
C:Employing the same techniques used to genetically enhance plants so that they are
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