The correct option is A Meteor activity would gradually increase to a single, intense peak, and then gradually decline.
The best answer is option A.
(A) This is stated in the passage"Conventional theories, however, predicted that the distribution of particles would beincreasingly dense toward the center of a meteor stream.
Choice B is exactly opposite of A. Choice C is not true from the context of the passage. Choice D is not mentioned in the passage.