Google Cloud Certified Associate Cloud Engineer Practice

The command that displays the documentation for creating a new Compute Engine instance using the Cloud SDK is "man gcloud compute instances create." This command utilizes the `man` command (short for manual), which is used in Unix and Unix-like operating systems to display the user manual of any command available in the system.

In this case, "gcloud compute instances create" is the correct syntax used in the Google Cloud SDK for creating a Compute Engine instance. The command structure follows the hierarchical nature of the gcloud commands, where "compute" is a command group and "instances create" is a specific action within that group.

The correct syntax is essential because it directly matches how the gcloud command is structured. When you use "man" with this specific command, it brings up comprehensive documentation that details how to utilize this command, including the required parameters and flags, thereby equipping users with the necessary information to create instances effectively.

The other choices offered do not correspond to the valid command syntax as defined by the gcloud tool. They either miss parts of the proper command structure or use formatting that doesn't align with the gcloud command line interface, making them unsuitable for retrieving the desired documentation.