Final answer:
The situation that best demonstrates an example of encroachment is a storage building that extends over the boundary line onto an adjacent property.
Step-by-step explanation:
The situation that best demonstrates an example of encroachment is b. a storage building that extends over the boundary line onto an adjacent property.
Encroachment refers to the intrusion or trespassing onto another person's property. In this case, the storage building extends beyond the boundary line, encroaching onto the adjacent property.