Why did passage of the kansas-nebraska act anger many free-soilers?

a.) it established slavery throughout the united states.
b.) it established slavery in two new united states territories.
c.) it removed a ban on slavery and supported popular sovereignty.
d.) it upheld the missouri compromise, which they did not support.

The passage of the Kansas-Nebraska Act angered many Free-Soilers because it established slavery in two new United States territories.

The Kansas-Nebraska Act was passed by the U.S. Congress on May 30, 1854. It allowed people in the territories of Kansas and Nebraska to decide for themselves whether or not to allow slavery within their borders.

The Free Soil Party was a short-lived political party in the United States active in the 1848 and 1852 presidential elections, and in some state elections. Founded in Buffalo, New York, it was a third party and a single-issue party that largely appealed to and drew its greatest strength from New York State. The party leadership consisted of anti-slavery former members of the Whig Party and the Democratic Party. Its main purpose was to oppose the expansion of slavery into the western territories, arguing that free men on free soil comprised a morally and economically superior system to slavery. 

The correct answer between all the choices given is the second choice or letter B. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.

d is the answer. leo should include the source.