Choice "A" is correct. Expected value computations that assign probabilities to potential outcomes quantify both the likelihood (percentage) and outcome (amounts) into a single value. Expected value is therefore the most useful of the listed statistics when risk is being prioritized.Choice "b" is incorrect. Low and high probability exposures identify ranges of likelihood but do not consolidate findings into a single expected value.Choice "d" is incorrect. Low and high degree loss exposures identify ranges of impact but do not consolidate findings into a single expected value.Choice "c" is incorrect. Uncontrollable risks are, by definition, not within the ability of the manager to mitigate. Like sunk costs that will not change regardless of priorities, uncontrollable risk is not useful when prioritizing risk.