B A reversion is a future interest of the grantor which will automatically follow a prior estate which will inevitably terminate (e.g., a life estate; a leasehold). A possibility of reverter is a future interest of the grantor which will automatically follow a prior estate which will not inevitably terminate (e.g., fee simple determinable). A right of re-entry is a future interest of the grantor which does not revert automatically, but which requires some act by the grantor in order for him/her to re-acquire a possessory right, and which follows an estate which will not inevitably terminate. Since the property was conveyed only for so long as it is used as a home for the elderly, it will automatically revert to the grantor if that use is ever discontinued. It is, thus, either a reversion or a possibility of reverter. Since it is not certain that it ever will cease to be used as a home for the elderly, however, the prior estate is not one which will inevitably terminate. For this reason, the grantor’s interest is a possibility of reverter. B is, therefore, correct, and A is, therefore, incorrect. C is incorrect because if the property ever ceases to be used as a home for the elderly, no act of the grantor is necessary to make his interest possessory. D is incorrect because the Rule against Perpetuities does not apply to a grantor’s interest.