The ditching machine did not have an impact on the price of newspaper publishing. The answer is A.
Early newspapers such as the news sheets seen in Venice, were handwritten. In Germany in the 1600s newspapers were printed for the first time. Since then, inventions such as:
and a few others allowed for increased production of newspapers. These machines allowed for multiple types of sheets to be set daily, continuous printing, low staff operations, and much more. These machines all contributed to a lower production cost and therefore lowered the price of publishing newspapers.
A ditching machine is a machine used to dig trenches. These trenches are sometimes used to carry water or bury power lines, among other uses. The invention of the ditching machine, though beneficial to civilization, does not impact in any way the production of newspapers. For this reason option A is incorrect.
For more on printing history see:
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