In 2015,Susan Tells the Art Museum,a Private Not-For-Profit Organization,that She

In 2015,Susan tells The Art Museum,a private not-for-profit organization,that she has named the museum in her will.When should the organization recognize the contribution revenue?

A) Only after Susan dies and the will is declared valid.
B) Ratably over a five year period beginning in 2015.
C) All in 2015.
D) When the Museum receives the contribution.