Refer to the Figure

Multiple Choice

Refer to the figure. The figure shows the cross section (at right) of a sea star arm.Within the arm are tube feet with two parts, an ampulla and a suction cup.The ampulla is a bulb-like structure that communicates with the suction cup.Which statement about these tube feet structures is false?

A) The ampulla is connected to the suction cup by a muscular tube.
B) The suction cup is an adhesive disk.
C) Muscular movement of the tube controls the suction cup.
D) The tube foot participates in gas exchange.
E) Water enters the suction cup and flows into the ampulla, eventually toward the madreporite.