Option D is correct because Google Cloud Marketplace offers a variety of pre-configured solutions, including WordPress. By searching for WordPress in the Marketplace, you can find and deploy the solution directly, saving time and effort as it comes pre-configured and ready to use. Option A is incorrect as manually following the installation guide and using a configuration management system can be time-consuming. Option B, while feasible with Terraform, may not be the quickest method. Option C involves additional manual steps with the gcloud CLI, making it less efficient than the direct deployment option provided by D. For more information, visit Google Cloud Marketplace.