Which Statement About Locomotion in Nematodes Is True

Which statement about locomotion in nematodes is true?

A) Rhythmically beating cilia move the animal forward.
B) Longitudinal muscles contract.
C) Circular and longitudinal muscles work against each other and the pseudocoelom to change the shape of the animal,moving it forward.
D) A series of hairs that project backward engage the substrate,and back-and-forth movements propel the animal forward.
E) Water expelled through special ducts moves the animal forward.