Well, the definition of shrewd is severe, basically.
Porcine means relating to pigs. Ursine means relating to bears. Vulpine means relating to foxes. Lupine means relating to wolves.
So, bears, foxes, and wolves are shrewd.
Wolves are the most shrewd.
So, someone who is shrewd could be described as lupine.
The word 'shrewd' describes someone who is clever and insightful. Among the options, 'vulpine,' relating to foxes, best captures the nature of being shrewd. Therefore, the correct answer is C. vulpine.
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