Answer: I would argue that the right answer is the C) Trickery.
Explanation: Just to elaborate a little on the answer, it can be added that since the rabbit is sneaking up in order to steal the sword—rather than being honest and ask to borrow it, for instance—and he laughs to himself when he gets it, it is possible to infer that he is showing neither carelessness nor anger or confusion, but trickery, deceit, and slyness. He has taken advantage of a specific circumstance—Bruh Lizard's departure— and has used it to his own advantage.