Answer: A fee simple subject to a condition subsequent
Step-by-step explanation:
The options to the question are:
1. A life estate pur autre vie
2. A fee simple subject to a condition subsequent
3. A non-freehold
4. A reversionary estate
From the question, we are informed that Frank conveyed a forty-acre parcel of land to Joe on the condition that the property be used as a tree farm and that Frank reserved the right of reentry. The kind of estate granted by Frank is a fee simple subject to a condition subsequent.
This kind of estate has a condition attached to it and they're also have a right of entry. In the event that a trigger occurs, the holder of the property will have to take necessary in order to get the land.
In this case, if the land isn't used as a tree farm, the land can be reclaimed by Frank.