Final answer:
A landlord's right to regain possession of the premises upon expiration of a lease is called reversion.
Step-by-step explanation:
The correct answer is B) Reversion.
A landlord's right to regain possession of the premises upon expiration of a lease is known as reversion. Reversion refers to the return of property to the original owner after a temporary possession or lease has ended.
For example, if a tenant's lease ends, the landlord has the right to re-enter and regain possession of the premises. This means the landlord can legally ask the tenant to move out and take control of the property again.