Slave codes were passed in the southern states in order to a. return runaway slaves to the slave owners b. put more control on slaves c. free the slaves d. punish people who runaway slaves

B.  They were used to put more control on  slaves.

it provided for selection of government employees through competitive examinations. it also made it unlawful to fire or demote covered employees for political reasons or to require them to give political service or payment, and it set up a civil service commission to enforce the law.

explanation:

the process of industrialization is called a revolution because