The intended audience for uncle tom’s cabin was

northern abolitionists
southern slaveholders
non-partisan americans
all of the above

The answer is: Southern slaveholders

“Uncle Tom’s Cabin” or “Life Among the Lowly” was a novel published in 1852 written with a strong and carefully anti-slavery argument, therefore, it was intended to the Americans who still supported the slavery, a Christian audience that needed to be convinced of the evil institution in which this practice consisted.

c. to depict the cunningness of the federal soldiers

yes this is an analog in my view