Your organization uses G Suite for communication and collaboration. All users in your organization have a G Suite account. You want to grant some G Suite users access to your Cloud Platform project. What should you do? 

Answer options:

A. Enable Cloud Identity in the GCP Console for your domain.
B. Grant them the required IAM roles using their G Suite email address.
C. Create a CSV sheet with all users` email addresses. Use the gcloud command line tool to convert them into Google Cloud Platform accounts.
D. In the G Suite console, add the users to a special group called cloud-console-users@yourdomain.com. Rely on the default behavior of the Cloud Platform to grant users access if they are members of this group.

B

Reference: https://cloud.google.com/resource-manager/docs/creating-managing-organization