Following are the figures showing germinal layers in organisms.

Choose the correct answer w.r.t. figures (a) and (b).

• A

  Figure (a), represents the germ layers in Porifera

  Figure (b), represents the germ layers in Coelenterata

• B

  In figure (a), A represents mesoglea, an undifferentiated layer

  Figure (b), C is ectoderm, D is endoderm and B is mesoderm

• C

  In figure (a), A represents coelom, surrounded by mesoderm

  Figure (b), B represents mesoderm

• D

  In figure (a), A is coelom in annelids
  Figure (b), represents triploblastic condition in flatworms