Which of the following best explains why we can rule out the idea that planets are usually formed by near collisions between stars?
(a)- Studies of the trajectories of nearby stars relative to the Sun show that the Sun is not in danger of a near collision with any of them.
(b)-Stellar near collisions are far too rare to explain all the planets now known to orbit nearby stars.
(c)-A near collision might have created planets, but it could not have created moons, asteroids, or comets.
(d)-A near collision should have left a trail of gas extending out behind the Sun, and we see no evidence of such a trail.