John Sells Some Property and the Deed Reads,"I Transfer This

Multiple Choice

John sells some property and the deed reads,"I transfer this property to the Boulder County Rat Kindness Society so long as it is used to promote kindness to rats,and if it ceases to be so used,then it comes back to the grantor (the seller) ." The type of ownership estate created is:

A) fee simple absolute
B) fee simple defeasible
C) fee simple subject to remainder
D) life estate
E) community property