In the Absence of White Laborers After the Transition Away

In the absence of white laborers after the transition away from indentured servitude, black slaves were​

A) more closely guarded but better cared for.
B) given fewer rights but still allowed their independent economy.
C) forced to work longer hours under worsening conditions.
D) more highly valued as they became the only source of labor.
E) not affected in terms of their overall conditions.