The correct answer is B. Deployment Manager, as it provides Infrastructure as Code (IaC) capabilities. Google Cloud Deployment Manager enables you to specify all the resources your application needs in a declarative format using YAML. Additionally, you can utilize Python or Jinja2 templates to parameterize the configuration, facilitating the reuse of common deployment patterns like load-balanced, auto-scaled instance groups. This approach allows you to treat your configuration as code and execute repeatable deployments.

• Option A is incorrect because Cloud Composer is a fully managed workflow orchestration service designed for authoring, scheduling, and monitoring pipelines across clouds and on-premises data centers.
• Option C is incorrect as Cloud Scheduler is a fully managed, enterprise-grade cron job scheduler, suitable for scheduling a wide range of jobs, including batch processes, big data jobs, and cloud infrastructure operations.
• Option D is incorrect since Cloud Deployer is not a valid Google Cloud service.