The prophet Obadiah delivers a short but potent message against Edom. What specific reason for judgment does Obadiah highlight regarding Edom's actions during Judah's distress?

A Edom's worship of false gods that led Judah astray. B Edom's economic exploitation of Judah through unfair trade practices. C Edom's refusal to aid Judah during an invasion, even rejoicing in their downfall and looting their cities. D Edom's military alliance with Babylon against Judah.