Final answer:
Constructive annexation occurs when personal property becomes a permanent part of real property, such as a wall sconce attached to a wall.
Step-by-step explanation:
Constructive annexation refers to when a personal property becomes permanently fixed to real property in a way that it becomes a part of the property itself. An example of constructive annexation is when a wall sconce is attached to a wall. Unlike other options, such as a TV mount, curtains on a curtain rod, or a curtain rod itself, a wall sconce becomes a permanent fixture and cannot be easily removed without damaging the property.