Under Which Condition Would Knowledge of Base Rates Assist Your

Under which condition would knowledge of base rates assist your decision-making

A)  You need to decide between two forms of treatment for a disorder. 
B)  You need to determine whether there is a causal relationship between a risk factor and a disease. 
C)  You need to determine whether a statistically significant risk is meaningful. 
D)  You need to determine whether your diagnosis is accurate.