The Body Cavity of a Coelomate Organism Would Act as a Hydrostatic

The body cavity of a coelomate organism would act as a hydrostatic skeleton because

A) muscular contraction would cause fluid movement in the cavity.
B) the tissues around the cavity are flexible.
C) the absence of a peritoneum allows for greater fluid movement.
D) segmentation allows for summation of movement.
E) the body cavity is positioned between the endoderm and ectoderm, allowing for greater control.