Current Understanding Holds That a Galaxy's Type (Spiral,elliptical,or Irregular)

Current understanding holds that a galaxy's type (spiral,elliptical,or irregular)

A) is always determined by the angular momentum of the protogalactic cloud that formed it.
B) may either be the result of conditions in the protogalactic cloud that formed it or the result of later interactions with other galaxies.
C) is determined by whether the galaxy is located in a cluster where collisions are likely or outside a cluster where collisions are less likely.
D) may either be a result of the mass of the protogalactic cloud that formed it or the result of the heavy element abundance in that cloud.