The correct answer is C.

Introducing stress testing scenarios that specifically focus on extreme market conditions allows the bank to assess the impact of potential severe changes in market conditions on its portfolio. This method is particularly effective in testing how well the bank's positions would hold under scenarios that include drastic shifts in market factor correlations, providing a proactive approach to understanding and mitigating potential risks.

A is incorrect. While shifting to a historical simulation approach could be useful, it relies heavily on the availability and relevance of past data that matches current geopolitical conditions. This approach may not capture future extreme conditions or the correct dynamics between market factors under altered geopolitical landscapes.

B is incorrect. Reducing the VaR confidence level might increase the frequency of predicted breaches (indicating higher risk), but it does not address the core issue of understanding or adjusting to changes in correlations between market factors under extreme conditions.

D is incorrect. Increasing the historical observation window for calculating correlations might provide more data, but it may also dilute the immediate effects of recent changes in market dynamics, potentially making the model less responsive to current events.

Things to Remember

• Stress testing is an essential tool for risk management, especially in handling non-linear and extreme risk scenarios that are not well-captured by traditional models like VaR.
• Real-life applications of stress testing include preparing for events like the 2008 financial crisis, where traditional risk management models failed to predict the scale of losses.