The answer is A. She compares him to a wolf, a ruthless predator that tracks its prey.
Lady Macduff compares Macbeth to a wolf when she says, "He's a traitor ... He kills people, just like a wolf kills animals. He doesn't care about the suffering he causes because he's violent and cruel." She compares Macbeth to a wolf because she believes that he is a predator who preys upon innocent people without any remorse, just like a wolf that kills animals without any compassion for their pain. She uses this comparison to emphasize Macbeth's cruelty and lack of concern for human life.
Therefore, the correct answer is A. She compares him to a wolf, a ruthless predator that tracks its prey.