Which of these phyla CAN have an asymmetrical body plan?

Mollusca, Arthropoda, Cnidaria, Rotifera, Platyhelminthes, or Porifera?



This isn't for a grade, but I am asking you guys because I suspect this to be a very tricky question. My knowledge tells me Mollusca.... because sponges (Porifera) always have asymmetry, unless I am mistaken. However, the Mollusca is a bit of a precarious answer (I'm hoping someone clears this up for me) when you consider what "body plan" means. Mollusca can have asymmetry after the process of torsion, but  does torsion technically alter the "body plan", which I assume is predetermined genetically?

What do you guys think?