Which of the following BEST summarizes a common argument against admitting California as a free state?
A.
It would force the federal government to cover the debts of building the western railroads.
B.
It would disrupt the existing balance of power between slave states and free states.
C.
It would encourage other territories to enter the union as free states.
D.
It would tip the balance of free and slave states in favor of free states.