How does Darzee’s wife move the plot forward in "Rikki-Tikki-Tavi"? She tells Rikki-tikki where Nagaina’s eggs are hidden. She kills Nag after Rikki-tikki corners him in a water jar. She tells Rikki-tikki that she overheard the cobras’ plan. She distracts Nagaina while Rikki-tikki destroys Nagaina’s eggs.