The correct answer is D. From a firm political stance against slavery.
Step-by-step explanation
The republican party was founded in 1854, it was mainly formed by former members of the Whig party after its disintegration, however, it also had members from the party or independent movements including the Democrat. Among its main motivations as a party was the issue of slavery, they had a radical anti-slavery position, in the same way, they were inclined towards the ideas of abolitionists, this generated acceptance in the entire population, mostly the black community. So, the correct answer is D. From a firm political stance against slavery.