Which Amazon Elastic Block Store (Amazon EBS) volume type should a solutions architect attach to their EC2 instance?

An application is running on an Amazon EC2 instance and must have millisecond latency when running the workload. The application makes many small reads and writes to the file system, but the file system itself is small.

Which Amazon Elastic Block Store (Amazon EBS) volume type should a solutions architect attach to their EC2 instance?
A . Cold HDD (sc1)
B . General Purpose SSD (gp2)
C . Provisioned IOPS SSD (io1)
D . Throughput Optimized HDD (st1)

Answer: C

Explanation:

Reference: https://aws.amazon.com/blogs/database/best-storage-practices-for-running-production-workloadson-hosted-databases-with-amazon-rds-or-amazon-ec2/