Read the following statements.

(a) Calcareous spicules constitute the skeleton of some of the sponges.

(b) Stinging corpuscles are present only on the tentacles of cnidarians.

(c) The property of a living organism to emit light is well-marked in ctenophores.

(d) All flatworms absorb nutrients from the host directly through their body surface.

In the above, the INCORRECT statements are

• A

  a and b

• B

  b and c

• C

  b and d

• D

  a, b and d