What would have happened to God's people without a remnant?

The correct answer is that without a remnant, God's people would have become like Sodom and Gomorrah. In Isaiah, the concept of a remnant refers to a small group of faithful individuals among a larger population that has turned away from God. This remnant symbolizes hope and continuity for God’s covenant people. The comparison to Sodom and Gomorrah serves as a stark warning of what happens when a society becomes wholly corrupt and unrepentant. These cities were destroyed due to their extreme wickedness and lack of righteousness, highlighting that without a faithful remnant to uphold God's standards, the people would fall into similar moral decay and judgment.

This context clarifies why the other choices do not align. The triumph over enemies, being called a great nation, or blessed with prosperity imply favor from God that depends on faithfulness. Without a remnant to maintain that faith and righteousness, those outcomes would not be possible. Thus, the mention of Sodom and Gomorrah effectively illustrates the dire consequences that would have awaited God's people in the absence of righteousness and faithfulness.