A Researcher Who Has Conducted Experimental Research Finds That in the Researcher's

A researcher who has conducted experimental research finds that in the researcher's 145-person hospital study, the patients who are ambulated on the evening of abdominal surgery are less likely than the control group to develop postoperative pneumonia. What does the researcher infer?

A) The control group resembled the experimental group in all important characteristics.
B) Early ambulation and pneumonia are strongly related.
C) Evening-of-surgery ambulation will prevent some cases of postoperative pneumonia in abdominal surgery patients.
D) Careful support of the abdomen is important for postoperative ambulation in patients who have had abdominal surgery.

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