What does the term $Asymmetrical$ mean in the context of animal body organization?

• A
  When any plane passing through the central axis of the body divides the organism into two identical halves.
• B
  Any plane that passes through the center does not divide the body into two equal halves.
• C
  Where the body can be divided into identical left and right halves in only one plane.
• D
  None of these.