The Supreme Court's decision in Dred Scott v. Sandford stated that Congress did not have the power to A. protect free African Americans,
B. outlaw slavery anywhere,
C. outlaw the Missouri Compromise,
D. return escaped enslaved African Americans,

In Dred Scott v. Sandford (argued 1856 -- decided 1857), the Supreme Court ruled that Americans of African descent, whether free or slave, were not American citizens and could not sue in federal court. The Court also ruled that Congress lacked power to ban slavery in the U.S. territories.

Explanation: i think C

they encountered severe weather for which they were poorly prepared.