If Smith mistakenly builds a fence on Jones's land, what can Jones do?

In a situation where Smith mistakenly builds a fence on Jones's land, Jones has the right to require Smith to remove the fence or pay damages. This scenario falls under property law, specifically focusing on the rights of property owners to their land. When someone builds on another person's property, the original owner is entitled to request that the encroachment be rectified.

If Smith built the fence without permission, it is considered an intrusion or encroachment upon Jones's property rights. Jones has the legal standing to demand the removal of the fence since it interferes with his property. Additionally, if Jones suffers any damages as a result of this encroachment—such as loss of use of his land—he can seek financial compensation.

This answer reflects the principles of property rights and the legal recourse available to landowners to protect their interests and maintain their property. Other options, while they may seem plausible, do not align with the typical legal responses for resolving property disputes in cases of accidental encroachment.