Gretchen bought a lot $17$ years ago and built a home with a solar heating system to heat her swimming pool. In the ${18}^{th}$ year of her ownership, however, Blair begins to build a three$-$story apartment building that will block most of the sun necessary for the system to function properly. Gretchen now argues she has an easement by prescription, since she tives in a state in which an easement in general can be acquired in $15$ years. Under the law of most states:

Blair can finish his building.

Gretchen could successfully argue that she has an easement by prescription.

Gretchen could not prove she owns an easement by prescription but could very likely prove an easement by necessity.

Blair would be estopped from building since Gretchen relied to her detriment on her neighbor's goodwill in allowing her access to the sunlight.