Beat The GMAT a GMAT & MBA community

Citing the frequency with which gum disease and heart disease occur in the same patients, many dentists believe that periodontal disease is a cause of a variety of cardiovascular problems, including Coronary Artery Disease.

Question : Which of the following, if true, would most weaken the claim that periodontal disease is a cause of Coronary Artery disease?
Choices
A - Bacteria present in infected gums can become mobile and enter the bloodstream, causing arterial plaque to accumulate.
B - People who brush and floss their teeth regularly are also more likely to exercise and eat a healthy diet.
C - Infected gums are more prone to bleeding, which allows bacteria to escape the mouth and irritate arteries.
D - People who experience loss of teeth due to periodontal disease usually cut back on many foods that are harder to chew, such as lean meats and vegetables, and increase their consumption of processed foods like pudding and ice cream.
E - Patients with no history of heart disease are much less likely to have periodontal disease than patients who have had a cardiac transplant.

OA: B