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Hi shisriz,
In this SC, the subject is "narwhals" (the whales of the ice). Since some people don't know that "narwhals" are living creatures, the rest of the sentence provides context clues to help you choose the correct answer. Those clues are the words "they seek..." and "their chief predator." Since those two plural pronouns are consistent, the third phrase should be parallel: "THEIR migrations follow..."
Final Answer: C
GMAT assassins aren't born, they're made,
Rich[/spoiler]
