Which of the Following Best Describes the Doctrine of Ademption

Which of the following best describes the doctrine of ademption?

A) When there are not enough assets to satisfy all the gifts in the will,the residual gifts will be the last to be paid.
B) When assets are distributed to lineal descendants,equal shares are given to all descendants regardless of which generation they are in.
C) If a decedent dies without owning the property that was the subject of a specific gift in the will,the beneficiary will receive nothing for it.
D) When there are not enough assets in the estate to satisfy all general gifts,they are all satisfied on a pro-rata basis.