Which statement about the southern code, which was followed by many white southerners in the 1800s, is true?

a. it resulted in free african americans in the north being treated worse than enslaved african americans in the south
b. it allowed southerners large plantations for cultivating cotton, a major cash crop in the south
c. it held that enslaved workers did work that was considered “unladylike” or “ungentlemanly” for white southerners
d. it resulted in many southerners freeing enslaved workers and opposing the practice of slavery