Which of the Following Was the Result in United States

Which of the following was the result in United States v. Park, the case in the text in which the president of a national food-chain corporation appealed his conviction of violating the federal Food, Drug, and Cosmetic Act by allowing food in a warehouse to be exposed to rodent contamination?

A) That the defendant could not be held liable because it could not be proven beyond a reasonable doubt that he knew warehouse employees were failing to take proper steps to ensure sanitary conditions.
B) That the defendant could not be held liable because it could not be proven by a preponderance of the evidence that he knew warehouse employees were failing to take proper steps to ensure sanitary conditions.
C) That the defendant could not be held liable because he did not personally cause the contamination.
D) That the defendant could be held liable because he hid evidence of the offenses.
E) That the defendant could be held liable because he failed to see that those delegated the duty to ensure sanitary conditions did their job.