In 2011,Jonah Sold a Building to His Two Married Sons

In 2011,Jonah sold a building to his two married sons: Alan and Charles.In 2012,Charles was thinking of severing the joint tenancy,but before anything was said or done,Charles and Alan both drowned in a boating accident.Charles died immediately,but Alan died two months later,never having regained consciousness.Charles had willed his interest in the property to his wife and Alan had willed his to his son.Given these facts,which of the following is true?

A) As soon as they made the wills, the parties became joint tenants.
B) Charles's wife and Alan's son now have a leasehold interest in the building.
C) Charles's wife and Alan's son have now acquired possession through adverse possession.
D) Alan's son is entitled to the whole property.
E) Charles's wife is entitled to the whole property.