Final answer:
Oracle Cloud Functions is ideal for running serverless apps within Oracle Cloud Infrastructure (OCI). This service manages resource provisioning and lowers costs by ensuring resources aren't consumed when applications aren't in use.
Step-by-step explanation:
The Oracle Cloud Infrastructure (OCI) service that is best suited for running serverless apps is Oracle Cloud Functions. Serverless apps need the ability to execute code in response to specific events, and this is exactly what Oracle Cloud Functions offers. This service automates the provisioning and management of the resources needed to run your applications, removing the complexity of infrastructure management. For example, when a serverless application is not in use, no resources are being consumed, which helps to optimize costs. Unlike options b, c and d, which include Virtual Machines, Block Storage and Networking respectively, Oracle Cloud Functions is specifically designed for running serverless apps.
Learn more about Oracle Cloud Functions