The answer is the last choice, commonality.
They should interview other people who fought in that same war ( which would be back up witness for these two different accounts). So whoever has the most back up witnesses must be telling the truth ( also make sure the other people you interview don't know they are back up witness).
Answer;
One scientific belief held by both Rene Descartes and Isaac Newton is that the reasoned thought is the way to discover truth.
Explanation;
Rene Descartes used deductive reasoning, deducing a conclusion from a set of premises, to determine the nature of the universe, that was contrary to other great thinkers of the time who used scientific observation.
Sir Isaac Newton; specialized in uniting experimental and theoretical elements of modern science.
Louisiana purchase, october 20, 1803
A third type of citizen could vote and practive commerce, but could not hold office or marry
