Nwhich of the following ways did the fugitive slave act contribute to the civil war? select the two correct responses.

a. the act provided certificates of freedom to slaves that made it to free territory, which angered plantation owners.

b. the act forced citizens to return runaway slaves to their owners which angered abolitionists.

c. some northern states passed their own laws that limited the impact of the act.

d southern states refused to enforce the law which increased tensions with the northern states.