If Sam takes possession of an unused farm, what must he do to potentially gain ownership?

To potentially gain ownership of an unused farm, filing a quiet title action to perfect title is the correct approach because it is a legal process used to establish ownership of a property. When someone occupies or tries to claim ownership of a property that they do not have a clear title to, such as in this scenario, a quiet title action can resolve any disputes regarding the ownership and confirm the rights of the possessor.

This process involves bringing a lawsuit to "quiet" any claims or challenges to the title, which could originate from previous owners or other claimants. If successfully executed, it allows Sam to obtain a clear title to the property, establishing his legal right to own it.

Other options, while they may seem beneficial for land management or personal benefit, do not legally transfer ownership. Notifying the owner regularly may maintain a relationship but does not influence ownership rights. Improving the land significantly could potentially enhance its value but does not address title issues. Selling crops from the farm might yield short-term benefits or income but has no bearing on property ownership either. Therefore, the best course of action for Sam, if he wants to secure ownership, is to file a quiet title action.