Answer:The Free-Soil Party had limited success in elections but paved the way for antislavery politics. Thus, option 'D' is the correct option.
Explanation:What is the Free Soil Party?
Between 1848 and 1854, when it merged with the Republican Party, the Free Soil Party was a brief-lived coalition political party in the United States. The opposition to the spread of slavery into American western territory was the party's main point of contention. The Mexican-American War's aftermath and discussions over extending slavery into the Mexican Cession led to the formation of the Free Soil Party during the 1848 presidential election. The new Free Soil Party was founded by anti-slavery Democrats, Whigs, and Liberty Party supporters when the Whig Party and the Democratic Party chose presidential candidates who were unable to rule out the expansion of slavery into the Mexican Cession.