...Now, I hold that Illinois has a right to abolish and prohibit slavery as she did, and I hold that
Kentucky has the same right to continue ad protect slavery that Illinois has to abolish it. I hold
that New York has as much right to abolish slavery as Virginia has to continue it, and that each.
and every state of this Union is a sovereign power, with the right to do as it pleases upon this
question of slavery, and upon all its domestic institutions....

Now, my friends, if we will only act conscientiously and rigidly upon this great principle
of popular sovereignty, which guarantees to each state and Territory the right to do as it pleases
on all things, local and domestic, instead of Congress interfering, we will at peace one with
another. Why should Illinois at war with Missouri, or Kentucky with Ohio, or Virginia with
New York, merely because their institutions differ? Our fathers intended our institutions should
differ. They knew that the North and the South, having different climates, productions, ad
interests, required different institutions.

It can be reasonably inferred from the passage that:
A: the speaker of the text was against slavery anywhere in the US
B: the speaker wanted slavery to expand in all states in the US
C: the speaker did now want the US federal government to make laws for or against slavery
D: the speaker wanted the united states federal government to make laws for or against slavery

The speaker seems to be neither pro slavery nor anti slavery. They seem more interested in letting the states doing their own thing, instead of letting the federal government step in to decide one way or another. At first the speaker mentions that Illinois has a right to abolish slavery. Then they mention that Kentucky has the right to protect slavery. Furthermore, they remarked that "every state of this Union is a sovereign power, with the right to do as it pleases". Much of the second paragraph reiterates this concept as well. Possibly the biggest evidence of this is when they said "instead of Congress interfering, we will at peace one with another."