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

• 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 openings to the outside