The correct answer is B. Cloud Bigtable, as it is specifically designed to offer low-latency and high-throughput data processing, making it an ideal choice for large-scale NoSQL data storage and analytics. Cloud Bigtable is a scalable, fully managed NoSQL wide-column database that supports both low-latency single-point lookups and precalculated analytics. It is well-suited for applications such as IoT, finance, adtech, personalization, recommendations, time series support, monitoring, and geospatial datasets. Options A. Cloud Spanner and C. Cloud SQL are incorrect because they are relational databases, not optimized for NoSQL data storage. Option D. Cloud Datastore is also incorrect as it is not designed for high-throughput analytics.