Jack Enters into a Verbal Agreement with the Owner of a Home

Jack enters into a verbal agreement with the owner of a home. He will reside in one of the rooms in the home and will share the kitchen with the owner. He does not sign a formal lease and he is advised that he can leave the premises at any time without notice. Likewise the landlord may ask him to leave the premises at any time without notice. Jack's tenancy is

A) term certain tenancy.
B) a tenancy at will.
C) a periodic tenancy.
D) leasehold tenancy.
E) a tenancy at sufferance.