For a real-time analytics application that consumes streaming data, which GCP service would be best suited for ingesting and processing large volumes of events per second?

*Explanation:* To build a real-time analytics application that ingests and processes large volumes of events per second, the best-suited GCP service is **Cloud Pub/Sub**. Cloud Pub/Sub is designed for high-throughput event ingestion and real-time data streaming. It provides the scalability and reliability needed for handling large event streams. While other services like Cloud Bigtable, Cloud Dataflow, Cloud Spanner, and Firestore may have their use cases, they are not specifically optimized for high-throughput event ingestion and real-time analytics.