Explanation/Reference:

Option A is the Correct choice because , Cloud Source repositories is a a fully featured, scalable, private Git repository hosted on Google Cloud . Cloud Build is a service that executes your builds on Google Cloud Platform infrastructure. Cloud Build can import source code from Google Cloud Storage, Cloud Source Repositories, GitHub, or Bitbucket, execute a build to your specifications, and produce artifacts such as Docker containers or Java archives. Container Registry is a private container image registry that runs on Google Cloud Platform. Google Kuberenetes Engine is ideal for deploying small services that can be updated and rolled back quickly.
Option B is Incorrect because , BitBucket isn't Google Cloud hosted service but it can be used to achieve the same results .
Option C is Incorrect because Jenkins on Compute Engine isn't Google hosted product , Cloud build is the right choice because it is a service managed by Google Cloud .
Option D is Incorrect because , the objective is to implement CI/CD pipeline not data processing pipeline .

When established, Direct Peering provides a direct path from your on-premises network to Google services, including Google Cloud products that can be exposed through one or more public IP addresses. Traffic from Google's network to your on-premises network also takes that direct path, including traffic from VPC networks in your projects. Google Cloud customers must request that direct egress pricing be enabled for each of their projects after they have established Direct Peering with Google. For more information, see Pricing.