Which of the Following Best Explains Why We Can Rule

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.