Why is there NO sandbox system in the "New Implementation of SAP S/4HANA cloud Single Tenant?

Why is there NO sandbox system in the "New Implementation of SAP S/4HANA cloud Single Tenant?
A . Because the project team uses the DEV system to confirm solution fit
B . Because SAP S/4HANA cloud, single tenant edition, contains predefined business
C . Because the customer may use the SAP model company
D . Because the fit-to-standard workshop is conducted using the Q system

Answer: B