Why Were Slave Children Taught to Call All Adults of a Certain

Why were slave children taught to call all adults of a certain age "aunt" or "uncle" and children of their own age "brother" and "sister"?

A) Since slave marriages were often broken or slave children separated from their parents, slave communities sought to act like extended families.
B) Since slave marriage was illegal, children had no idea who their real relatives were.
C) White masters insisted that their slaves mimic white patterns of addressing each other.
D) If the slaves on a plantation made it appear they were all blood relatives, they could convince the master not to sell and send any of them away.