Which service in OCI provides block storage?

Block Volume Service is the correct answer because it is specifically designed to provide block storage in Oracle Cloud Infrastructure (OCI). This service allows users to create and manage block volumes, which are storage devices that can be attached to compute instances. Block volume storage is optimized for high-performance applications and workloads that require low-latency storage with high throughput.

When using the Block Volume Service, you have the ability to scale your storage independently from compute instances, allowing for greater flexibility in resource management. Additionally, block volumes can be automatically backed up to ensure data durability and can be cloned for test environments or other purposes.

Other services such as Object Storage Service focus on storing unstructured data in a highly scalable manner, while File Storage Service targets file-based storage needs that allow for shared access across multiple instances. Database Storage Service, while related to storage, is specifically intended for database use cases and does not provide general-purpose block storage functionality.