How did the Kansas-Nebraska Act influence enslavement?

It removed the Missouri Compromise, allowing states to decide for themselves whether they could enslave people.

It got rid of the Fugitive Slave Act, which meant that enslaved people were allowed to be citizens after being in a free state.

It changed the Compromise of 1850, forcing Kansas and Nebraska to become free states.

It followed the rule of the Missouri Compromise, admitting Nebraska as a state allowing enslavement and Kansas as a free state.