Mashaal Masha
A group of ecologists led by Axel Mithofer at the Max Planck Institute for Chemical Ecology in Germany examined the defensive responses of two varieties of the sweet potato ________ TN57, which is known for its insect resistance, and TN66, which is much more susceptible to pests.

Which choice completes the text so that it conforms to the conventions of Standard English?
Difficulty: Hard
A: 

plant.

B: 

plant;

C: 

plant

D: 

plant:

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