PT 65 S1 Q1

In a recent study of more than 400 North American men and women whose previous ... ...

Which one of the following, if true, most strengthens the argument?
(A) Research has shown that eliminating almost all fat from one’s diet can be effective in decreasing the likelihood of a second heart attack.
(B) ...
(C) ...
(D) ...
(E) ...

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