In the south during the industrial revolution,

all southern farmers had enslaved workers.
most plantations had fifty or more enslaved workers.
about twenty-five percent of southern households had no enslaved workers.
about twenty-five percent of southern households had enslaved workers.

D) about 25% of Southerners had enslaved workers.

Not everyone in the South operated with slaves as their labor force. There were also smaller family farms and such.  But those who did hold slaves in operating plantations held large numbers of slaves, and so the institution of slavery was a gigantic part of the Southern economy.

D. about twenty-five percent of Southern households had enslaved workers.

Just took quiz.