Passage 1   Every year, Americans spend millions of dollars ... ...

Consider two people who eat from the same low-carbohydrate menu. Which one of the following would weaken the author’s argument in Passage 1?
(A) Person A does not exercise. Person B does not exercise. Person A loses two more pounds than Person B.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Nova Reading D: Extra RC Practice 3