Which of the following is not a characteristic feature of phylum $Nemathelminthes$?

• A
  Bilateral symmetry,triploblastic,pseudocoelomate.
• B
  They are possibly most abundant amongst the animals.
• C
  The false body cavity allows body wall muscles and digestive tract muscles to act independently of each other.
• D
  The body wall has longitudinal muscles,circular muscles and an elastic cuticle.