What Aspect of Bwa Initiation Rites Developed in Response to the Threat

What aspect of Bwa initiation rites developed in response to the threat of slave raiders in the nineteenth century?

A) telling members of the community that initiates had been devoured by wild beasts
B) the use of wooden masks with geometric designs
C) separating initiates from younger playmates
D) forcing initiates to remove their clothes and sleep on the ground without blankets