Even though MacArthur’s diet book helped many people lose weight, MacArthur ... ...

Even though MacArthur’s diet book helped many people lose weight, MacArthur should not have published it. It recommended such small portions of fruits and vegetables that it undoubtedly damaged the health of many who followed the diet. MacArthur is a physician, so MacArthur either knew or should have known that diets low in fruits and vegetables are unhealthful. Which one of the following principles, if valid, most helps to justify the argument’s reasoning?
(A) One should not undertake an action if one knows that doing so would seriously damage the health of many people.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Oct 2012 LSAT (PT67): Logical Reasoning B

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