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PLEASE HELP ASAP!!(please do not put a link for an answer)

Why were Southern states concerned about Kansas and Nebraska becoming
states in the 1850s?

A. Both new states supported popular sovereignty, which weakened
federal power.

B. Both new states supported Democratic leaders, who were
unpopular in the South.

C. Both new states had huge populations, giving them more political
power

D. Both new states were located in the North, where slavery could be
banned.