You work for a large company that recently acquired three smaller startups.

The correct answer is C because the resources must be centrally managed under a single Google Cloud organization, but each startup requires separate billing and invoicing. Folders provide administrative separation inside one organization, while separate Cloud Billing accounts allow costs to be tracked and invoiced separately. Google Cloud Billing accounts define who pays for linked resources, track charges for projects linked to that billing account, and invoiced accounts result in invoices per Cloud Billing account. A single shared billing account would not satisfy the requirement for separate monthly invoices. Creating multiple organizations would violate the requirement for centralized management under one Google Cloud organization.