Subrogation inheritance refers to a system in which the descendants of the descendant's immediate children inherit the share of the inheritance that should be inherited when the children of the heirs die before the heirs die. By definition, which of the following is the following subrogated inheritance? ["Heir A was killed in a car accident while inheriting his father's estate, and the property was inherited by A's son B.", 'A died before his brother B, and son C of father A inherited the property of B.', 'A and B couples, in an intentional accident, A and B died successively, and their son C inherited the property of the two.', "A. B is a father and son. In an accident, B is presumed to die before his father A. and B's son inherits A's legacy."]