Alexis Positioned His New Fence Exactly Where He Wanted It

Alexis positioned his new fence exactly where he wanted it, even though it significantly encroaches on his neighbour's property. Which of the following would immediately let Alexis know he has most likely erred on the wrong side of the law?

A) being served with a claim for negligent construction
B) being served with a claim for occupiers' liability
C) having to defend an action for trespass
D) having to defend an action for nuisance