Deidre Watson Has a Home Located in a Residential Area

Deidre Watson has a home located in a residential area. Her home was constructed by her parents in 1920. In her back yard she has chicken coops, fenced-in areas for her horses, and a windmill. The area around her home has now been developed into a subdivision and her neighbors have complained about the chickens and horses. What is Deidre's best defense if the city issues an order requiring the removal of the animals and windmill?

A) That it is a taking by eminent domain
B) That she has a protected nonconforming use
C) That she is entitled to a variance
D) That the area is cumulative