Which of the following was not a problem with missouri’s application for statehood in 1820?

a. northerners believed that admitting missouri as a slave state would shift power in the senate to the slave states
b. if missouri were admitted to the union, any other state could only be admitted as a slave state
c. missouri was partly above the mason-dixon line, which put the undeclared boundary between the north and south in jeopardy
d. there would no longer be equal numbers of slave and free states