Which is the BEST way to combine these sentences without changing the meaning?

This war was over. Another war was just beginning.
Responses
A This war was over, but another one was just beginning.This war was over, but another one was just beginning.
B Because this war was over, another one was just beginning.Because this war was over, another one was just beginning.
C This war was over because another war was just beginning.This war was over because another war was just beginning.
D Because another war was just beginning, this war was over.

This war was over, but another one was just beginning.