19. in the old south, the majority of slaves
a. worked under a task system.
b. lived on small farms.
c. lived on plantations with 100 or more slaves.
d. lived on plantations with 20 or more slaves.

In the Old South, the majority of slaves C. lived on plantations with 100 or more slaves.
At the time, the slave owners had large numbers of slaves on their plantations, because it usually wasn't as lucrative to have just a few of them.