Why would a company choose to maintain a certain level of cash as a reserve...

Maintaining a cash reserve is a core element of prudent working capital management. Firms hold cash to meet transaction needs, precautionary needs, and sometimes speculative opportunities. The precautionary motive is particularly important, as it allows firms to handle unexpected expenses, revenue shortfalls, or economic disruptions without relying on costly external financing. Adequate liquidity reduces the risk of financial distress and enhances operational flexibility. Financial management theory emphasizes balancing the opportunity cost of holding cash against the benefits of liquidity. Option C accurately reflects this precautionary and liquidity-focused rationale.