The correct option is A Annelida, Mollusca, Arthropoda
Porifera - Asymmetrical, cellular level of organisation, acoelomates
Cnidaria and Ctenophora - Radial symmetry, diploblastic, acoelomates
Platyhelminthes - Bilateral symmetry, triploblastic, acoelomates
Aschelminthes - Bilateral symmetry, triploblastic, pseudocoelomates
The phyla Annelida, Arthropoda, Mollusca, Echinodermata, Hemichordata and Chordata exhibit bilateral symmetry. They are triploblastic and are eucoelomates.