Scientists studied how the mass of alcohol drunk per day affects the relative risk of getting heart disease. The graph shows the results of their study.
relative risk = $\frac{\text{the number of people getting heart disease who drink each mass of alcohol}}{\text{the number of people getting heart disease who drink no alcohol}}$
Which conclusion can be made from this graph?
Drinking 80g of alcohol a day does not increase the risk of heart disease.
2 )
Drinking above 80g of alcohol per day reduces the risk of heart disease.
3 )
Drinking alcohol has little effect on the risk of heart disease.
4 )
Drinking any mass of alcohol increases the risk of heart disease.
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