Answer: C) antislavery Whigs and Northern Democrats.
The Free Soil Party was a political party in the United States between 1848 and 1852. Its main purpose was to oppose the expansion of slavery into the Western Territories. The party was created in New York by the Barnburners (anti-slavery New York Democrats), anti-slavery Whigs and the Liberty Party. Tensions regarding slavery were reduced after the Compromise of 1850, and by 1856, party membership had been largely absorbed by the Republican Party.
