Final answer:
Azure DevOps is the service that provides version control tools to manage code, including services like Azure Repos for source control.
Step-by-step explanation:
The Azure service that provides a set of version control tools to manage code is c) Azure DevOps. Azure DevOps includes various services such as Azure Repos, which offers Git repositories or Team Foundation Version Control (TFVC) for source control of your code. It is a part of a broader suite of tools that also assist with project management, build automation, testing, and deployment processes, making it a comprehensive solution for software development projects.