Refer to the Figure Showing the Excretory System of an Annelid

Refer to the figure showing the excretory system of an annelid. Based on the figure, which statement about the excretory system of annelids is false?

A) Structure 8 is a nephridiopore through which dilute urine exits the animal.
B) The walls of structure 6 are impermeable and prevent blood from leaving the closed circulatory system of annelids.
C) Ammonia diffuses directly from tissues into structure 7.
D) Cells of structure 4 reabsorb and secrete certain molecules.
E) Structure 3 has cilia that sweep coelomic fluid into the metanephridium.