The free soil party would most likely agree with which of the following a.plant system b.manifest destiny c. increased immigration d. popular soveregnty ? ?

The correct answer is:

D. Popular soveregnty.

One example of this when was Lewis Cass, the Democratic Party's 1848 presidential nominee, supported popular sovereignty for determining the status of slavery in the United States territories. The party wanted to abolish slavery, because it claimed that it was undemocratic and did not enhance the dignity of work.