Which of the Following Is Not a Strong Argument for the Theory

Which of the following is not a strong argument for the theory that some large elliptical galaxies formed as the result of galaxy collisions?

A) Elliptical galaxies dominate the population in dense galaxy clusters.
B) Some ellipticals have stars and gas that rotate opposite to the rest of the galaxy.
C) Some elliptical galaxies are surrounded by shells of stars.
D) Computer simulations predict that the product of a galaxy collision is generally an elliptical galaxy.
E) Galaxy collisions are common and most galaxies in the universe are elliptical.