WILL MARK BRAINLEST ! Which is the BEST way to combine these sentences without changing the meaning?

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