- A Cnidaria
- B Porifera
- C Ctenophora
- D Platyhelminthes
Correct answer: B. Porifera
Explanation: Phylum Porifera includes sponges, which have numerous pores (ostia) and a cellular level of organization.
Concept context
Phylum-level classification of the animal kingdom from Porifera to Chordata, based on body symmetry, coelom, and segmentation. One of the most example-heavy chapters for NEET.