The figures $(A-D)$ show four animals. Select the correct option with respect to a common characteristic of two of these animals.
- A$(A)$ and $(D)$ respire mainly through body wall.
- B$(B)$ and $(C)$ show radial symmetry.
- C$(A)$ and $(B)$ have cnidoblasts for self-defence.
- D$(C)$ and $(D)$ have a true coelom.
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