Explanation

Based on the Basel Committee's guidance on liquidity risk Early Warning Indicators (EWIs), the most relevant indicator in this scenario is Option C: Difficulty placing short-term liabilities in the market.

Analysis of the Scenario:

1. Decline in ability to issue short-term commercial paper - This directly indicates difficulty in placing short-term liabilities in the market, even when offering higher interest rates

2. Institutional counterparties demanding additional collateral - This suggests counterparties are becoming more risk-averse and concerned about the bank's creditworthiness

3. 15% month-over-month drop in retail deposit balances - This indicates funding instability and potential loss of stable funding sources

Why Option C is Correct:

• The Basel Committee specifically identifies "difficulty in placing short-term liabilities" as a key EWI for liquidity stress
• The scenario describes exactly this situation: the bank cannot issue commercial paper despite offering higher rates
• This indicator reflects market perception of the bank's creditworthiness and potential liquidity pressures

Why Other Options Are Less Relevant:

• Option A: While rapid asset growth funded by volatile liabilities is an EWI, the scenario doesn't mention rapid asset growth
• Option B: Increasing CD redemptions is an EWI, but the scenario focuses on inability to issue new liabilities rather than early redemptions
• Option D: A credit rating downgrade is an EWI, but the scenario doesn't mention any downgrade has occurred

The combination of difficulty issuing commercial paper, counterparties demanding more collateral, and declining deposits collectively points to Option C as the most directly relevant EWI in this situation.