The statement that best supports Karl Marx's argument in the quote from the Communist Manifesto—"The history of all hitherto existing society is the history of class struggles"—is:
Women led a march on the Palace of Versailles to demand cheaper bread prices.
This event exemplifies class struggle as it reflects the economic hardship faced by the lower classes (specifically women and the working population) against the ruling class and the aristocracy, highlighting the tensions and conflicts that arise from differing class interests. The march was driven by the struggle for basic needs and represents the broader social and economic conflicts that Marx emphasized in his analysis of history.