Answer:
B or D
Explanation:
I'm not sure if it's correct... it just feels right
Making a business case, ur welcome
From what I have learned about stingrays... They don't exactly "sleep" But they do go in a state of awareness when they "sleep" They sleep anytime they want (its not like they can tell time lol)
I think the answer is Khoisan or either Shona but I'm leaning more toward Khoisan. Hope this helps!! good luck!!