Part A: did the study 1 prove that moderate wine drinking causes a lower risk of heart disease? Yes or no

Part B: explain how the study 2 sheds light on the study that says that moderate wine drinkers have a lover risk of heart disease. Does it make us more less certain about the effects of moderate wine drinking?

1. This observation makes us more certain that drinking a moderate amount of wine lowers the risk of heart disease

2. This observation makes us less certain that drinking a moderate amount of wine lowers the risk of heart disease