Which one of the following phyla is correctly matched with its two general characteristics?

Options

A. Echinodermata – Pentamerous radial symmetry and mostly internal fertilization
B. Mollusca – Normally oviparous and development through a trochophore or veliger larva
C. Arthropoda – Body divided into head, thorax and abdomen and respiration by tracheae
D. Chordata – Notochord at some stage and separate anal and urinary opening to the outside

Answer

B

Explanation

Molluscs usually show indirect development which is mediated by free swimming larval stage like trochophore, Veliger in Pila, Glochidium in Unio.