A research paper indicates that losing weight is positively correlated to the risk-of dying of heart disease and stroke. A newspaper then proceeds to infer that it might be dangerous to lose weight. The newspaper's causal inference is questionable because it ignores the possibility that a. exercise is very important to health b. obese patients are more likely to lose weight after experiencing early signs of heart disease and stroke c. the effect of age on health d. weight gain can also cause heart disease e. the effect of weight gain is mitigated by gaining weight slowly