PT 65 S4 Q10

In trying to reduce the amount of fat in their diet, onaverage people ... ...

Which one of the following, if true, most helps to resolve the apparent discrepancy described above?
(A) Many more people have reduced their consumption of red meat over the last two decades than have not.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Dec 2011 LSAT (PT 65): Logical Reasoning B