You're working on a financial application that requires extremely low-latency data retrieval. Which Google Cloud storage option would be most appropriate for this kind of workload?

*Explanation:* For a financial application that demands extremely low-latency data retrieval, the most suitable Google Cloud storage option is **Cloud Bigtable**. Cloud Bigtable is a fully managed NoSQL database service that offers low-latency data access and is designed for high throughput. It is particularly well-suited for use cases where data retrieval speed is critical, such as financial applications. The other options (A, B, D, E) are not optimized for low-latency access and may not meet the stringent performance requirements of a financial application.