It can be inferred from the last paragraph of the passage that which of the following must
A.Most meteor streams it encounters are more than 2,000 years old.
B.When passing through a meteor stream, it usually passes near to the stream’s center.
C.It crosses the Geminid meteor stream once every year.
D.It usually takes over a day to cross the actual Geminid meteor stream.
E.It accounts of msot of the gravitaitonal perturbation affecting the Geminid meteor stream.