Grandpa Calls His Grandson,Billy,and Says,"I Want You to Have My

Grandpa calls his grandson,Billy,and says,"I want you to have my toy train set.I'll bring it by next week." Billy says that he would love to have it.Grandpa dies unexpectedly that afternoon; in his will,he leaves everything to Alicia,Billy's cousin.Which is true?

A) Billy gets the train, because of his agreement with Grandpa.
B) Billy gets the train, because there was donative intent on Grandpa's part, and Billy accepted the gift.
C) Alicia gets the train, because Grandpa had not yet delivered the train to Billy.
D) Billy gets at least a partial interest in the train, because Grandpa cannot treat Billy's cousin more favorably than Billy in his will.
E) This is a gift "causa mortis," because Grandpa died before he could complete the gift.