Answer:
C.
Step-by-step explanation:
Senator Stephen Douglas proposed the Kansas-Nebraska Act in 1854. The act created two territories Kansas and Nebraska. The act was also important for building a transcontinental railroad to link the eastern states to the Pacific.
The act was written to gain support for a transcontinental railroad. Stephen Douglass was one of the chief supporters of railways. To build the railways, rail lines were to be laid through Nebraska which was beyond the north of the Missouri Compromise.
Therefore, option C is correct.