Which of the Following Defines a Form of Future Interest

Which of the following defines a form of future interest in real property known as a remainder?

A) It is a right of possession that returns to the grantor after the expiration of a limited or contingent estate.
B) It is a right of possession that returns to a third party on the expiration of a limited or contingent estate.
C) It is a form of concurrent possession of a multiple-dwelling building in which a corporation owns the building, and the residents own shares in the corporation.
D) It is a form of concurrent possession that includes the right of survivorship.