The prophet Obadiah delivers a strong condemnation against Edom. What is the primary reason for God's judgment against Edom, as revealed in Obadiah's prophecy?

A Edom's idolatry and worship of foreign gods. B Edom's failure to provide military assistance to Israel. C Edom's exploitation of Israel's natural resources. D Edom's rejoicing and taking advantage of Judah's distress during its downfall.