Answer: Market-weighted historical simulation.

## Explanation Let's analyze each option: **A. Volatility-weighted historical simulation** - This is a valid improvement that adjusts historical returns based on current volatility levels, making the VaR estimate more responsive to current market conditions. **B. Age-weighted historical simulation** - This is a valid improvement that gives more weight to recent observations and less weight to older observations, making the VaR estimate more responsive to recent market conditions. **C. Market-weighted historical simulation** - This is NOT a recognized improvement to historical simulation. There is no standard VaR methodology called "market-weighted historical simulation" in financial risk management literature. **D. Correlation-weighted historical simulation** - This is a valid improvement that adjusts for changing correlation structures in the market, making the VaR estimate more accurate during periods of changing market dependencies. Therefore, the approach that does NOT improve traditional historical simulation is **Market-weighted historical simulation**. **Correct Answer: C**

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