I think your question is: after which Genocide was this the case?
It might have been more than one genocide, but it was definitely the case in the Rwandan Genocide. Specifically it is estimated that around 100 000 children live in such households. (but his data is from 2003, so in the meantime those children grew up)
Answer:
Maybe a plain since it's all flat
The Pacific Ocean is in the Western U.S., so that is definitely not the answer. The Great Lakes are in the Eastern U.S. region, and so is the Ohio River. The Caribbean Sea is in Latin America, so that answer is not correct. The answers to this question are A and C.
