In the experiment, the researchers determined the relative abundance of two bacterial species found in the rumen of cattle. The rumen is a part of the stomach that acts as a fermentation chamber in cattle and other ruminants. Shown in the table are the results from before and after an abrupt change in the cattle's diet. Based on the results, which of the following best explains why the initial hypothesis should be revised?AThe diets were too similar, since cellulose and starch are both carbohydrates obtained from eating plants.BThe abundance of one of the bacterial species increased in response to the change in diet.CThe change in the diversity of microorganisms had no observable effect on cattle physiology.DThe ability of rumen fluid to resist changes in pH counteracted the changes in microorganism diversity.

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