Equity price risk is a quantifiable risk as it can be measured using historical data and statistical models (e.g., Value at Risk). The risk of a terrorist attack is an event risk that is generally considered nonquantifiable because of its unpredictable nature and lack of reliable historical data for statistical modeling. Default risk, liquidity risk, and settlement risk can often be quantified. Civil war is a nonquantifiable risk, so B and D are incorrectly matched.